About Us


GeoStabilization International
Business Hours Phone: 855.579.0536
Administrative Office Mailing Address: PO Box 4709, Grand Junction, CO 81501
Fax: 970.245.7737

History & Philosophy


GeoStablization International began through the vision of founders Robert Barrett, P.G. and Al Ruckman, P.E..  Both had spent 30+ year careers in public sector transportation and became known internationally for their contributions and leadership in geotechnical research, design, construction, and maintenance.  Building on their broad experience and inspired by their research discovery, the Soil Nail Launcher, they formed Soil Nail Launcher, Inc. a landslide remediation company.  In 2008, sons Colby Barrett, P.E. and Tim Ruckman took over the company and have continued the philosophy of their fathers. Barrett and Ruckman continued to build from that foundation into today’s GeoStabilization International, the leading geohazard mitigation company in North America.


GeoStabilization International credits its success to the founding philosophy of serving the client with the newest technologies, the best solutions, and the fastest possible service.  Through many years of training, experience, and this founding philosophy, GeoStabilization engineers and constructors now stand as the most qualified and most experienced in the industry.

Environmental Benefits

GeoStabilization’s focus on bringing new technologies to the geohazard repair industry reduces project time, cost, and also minimizes environmental impact.  Our geotechnical engineering staff focuses on the most efficient use of component materials (for example, using steel and fiberglass in tensile applications rather than in bending or shear) while our field operations group focuses on creating purpose-built equipment to maximize installation speed while minimizing site disturbance. For example, our Soil Nail Launchers™ can install up to 250 20-foot long nails in a day, using an excavator mounted carrier that eliminates the need for access roads. Our fleet of purpose-built wagon drills, spider-excavator mounted drills, and  vertical access air-track drills can be utilized on slopes of any inclination to drill holes up to 6-inches in diameter up to 200-feet deep – again, with no need for access roads or significant site disturbance, making GeoStabilization’s approach ideal not only for difficult access sites, but also for environmentally sensitive areas and coastal/riparian sites.

GeoAmericas Conference

Al (far left) and Bob (far right) handing over the company reins to Tim (left) and Colby (right) at the GeoAmericas Conference in Cancun, Mexico, in 2008.

Toolbox Talk

GeoStabilization crews conducting a morning “toolbox safety talk” prior to beginning work for the day.

Grouting Soil

Tim and Colby grouting SuperNails from ropes near Hawkins Bar, CA, in 2004.

NOVA Award - Construction Innovation Forum

Bob (right) and Mike Adams (FHWA) accepting the 2009 NOVA Award from the Construction Innovation Forum

Keynote: Seismic Response of Geosynthetically Reinforced Soil Structures

Bob and Al after a keynote address at a conference in Taiwan on Seismic Response of Geosynthetically Reinforced Soil Structures shortly after the Chi Chi Earthquake








Leadership Team


Al holds a B.S. in Civil Engineering from the University of Colorado and holds four patents in the area of rock and soil slope stabilization methods and innovations in soil nailing. Al worked at the Colorado Department of Highways from 1963 to 1982 in the area of materials engineering and geotechnical engineering. During this time he was involved in highway designs including slope stability, highway stability, structural inspections and material designs. Research performed during this time included soil collapse potential, swelling of bedded shales and clays, and soil reinforcement. Included in this work was the design and construction supervision of the Glenwood Canyon fabric walls with instrumentation for determining strain and deformation of the full height test walls.

In 1982 he began work for Corn Construction Company as the Materials and Quality Control Engineer. In this position he was responsible for locating and obtaining materials for highway construction projects in five western states. In 1986 he took over the materials laboratory of Sergent, Hauskins & Beckwith Consulting Engineers in Phoenix. In this position he was responsible for the instrumentation of structural foundation elements, including the installation and operation of load cells, inclinometers, strain gauges, piezometers, and supervision, training and operation of the 1000 ton load test frame. Among his projects was the design of fabric reinforced soil walls.

In 1994 Al returned to Denver to consult independently for soil nail shoring and reinforced soil design and construction in Colorado. He designed and supervised construction of geosynthetic confined soil walls as great as 93 feet in height. He designed and supervised construction of ground anchored and soil nail walls up to 110 feet in height. After consulting for Yenter Companies for several years, he joined Yenter as Chief Engineer and later became President of the company.

Al has design responsibility for hundreds of reinforced soil structures throughout the U. S. and internationally, valued at well over a 300 million dollars, and over 100 soil nail walls and landslide stabilization repairs using soil nails totaling over 100,000 square feet. He is one of the top geotechnical and structural researchers, innovators, designers and constructors in the world, and currently lives in Palisade, Colorado.

BOB BARRETT, P.G. : Founder & Director of Innovation
BOB BARRETT, P.G., Founder & Director of Innovation

Bob Barrett holds a B.S. in Geology from Marshall University. Bob worked for the West Virginia DOT and the Colorado DOT for over 30 years as a landslide specialist and as the chief geologist for design and construction of Interstate 70 across the Colorado Rockies. Bob was Manager of Geotechnical Research for the Colorado DOT and for the Colorado Transportation Institute, was a co-inventor of the Colorado Rockfall Simulation Program (CRSP), and received the 1991 Colorado Governor's award for creativity and innovation in government service. He chaired the Transportation Research Board Committee on Geosynthetics , the NCHRP Panel on Sealing Geotechnical Boreholes, and NCHRP Panel 12-59, dealing with design of GRS bridge abutments. He is a leading researcher in the Geotechnical area and holds patents for rockfall mitigation devices and Geosynthetically Confined Soil (GCS®) retaining wall innovations. He and Al have patents on Earthquake Wings for bridges and Scour Micropiles for Open Bottom Boxes and other applications. Bob is currently a member of the NCHRP Project Panel to develop seismic guidelines for GRS bridge abutments. He was the former Manager of Bridge Design and Construction for Yenter Companies and now advises the Board of Directors of GeoStabilization.

Bob and Al Ruckman were the recipients of the 1998 IFAI international design award for the design and construction of a 55-ft high GCS® retaining wall in Grand County, Colorado, and continue to enjoy solving difficult problems. Together, they have presented technology transfer programs on five continents on the subjects of GCS®, landslide mitigation, and rockfall control. They have constructed GCS® walls and abutments across the globe. Bob lives in Grand Junction, Colorado, with his wife, Linda.


Tim continues to be the mastermind behind GeoStabilization's innovations in tools, equipment and techniques. These concepts and techniques are utilized in repairing landslides more efficiently in remote locations in the US, New Zealand, Australia, and Canada. Tim has over 15 years of construction management and soil stabilization experience, serving as project manager and field superintendent on projects as large as $30 million. As the previous president of Rock Creations, Inc., Tim is also an expert in dry stacked stone and block faced GCS walls. Tim combines his experience with his superior skills in planning, scheduling, and teaching to ensure job quality every time. Tim lives in Phoenix, Arizona.



COLBY BARRETT, J.D., P.E. : President
COLBY BARRETT, J.D., P.E., President

Colby has worked on stabilization projects for over 15 years, managing projects throughout the continental United States, Puerto Rico, and Jamaica. After studying Chemistry and Chemical Engineering at the University of California at Berkeley and Oxford University on an NROTC scholarship, Colby served as a Captain in the United States Marine Corps. He led both infantry and scout/sniper platoons throughout the Pacific Rim and Middle East as part of various operations including Noble Eagle and Enduring Freedom, where he earned the Navy and Marine Corps Achievement Medal for outstanding performance. Colby also holds a Juris Doctor from Yale Law School and is a Registered Professional Engineer. Colby has authored numerous papers on landslide and erosion control as well as Geosynthetically Confined Soil technology. Colby regularly presents workshops across the United States and has given invited presentations in Canada, Mexico, New Zealand, and Taiwan.  He is an active geotechnical researcher in soil nailing and confined soils, holds several patents in the field, serves as a member of the Deep Foundations Institute Landslide/Slope Stabilization Committee, and won the prestigious EY Entrepreneur Of The Year™ award in 2014. Colby lives in Boca Grande, Florida, with his wife, Leslie; their sons Lachlan, Bridger, and Remington; and their daughter, Vivian.

Click on the links below to see Colby in the news.

Roads and Bridges Magazine Profile

Denver Business Journal

KIM RUCKMAN-WRIGHT : Chief Administrative Officer
KIM RUCKMAN-WRIGHT, Chief Administrative Officer

Since joining the GeoStabilization International team in 2006, Kim has never shied away from challenges. Formerly of Qwest Communications, Kim founded the company’s Business Division. Kim has been with the company since its infancy, where she filled a need for management and developed the culture of safety and efficiency that allowed GeoStabilization to become the company it is today. She has sat on the Board of Directors, acted as GeoStabilization's CFO, as well as the acting COO (overseeing daily operations, contracts, administrative management, and financials) until 2014, when she was promoted to the GeoStabilization's Chief Administrative Officer. As CAO, Kim continues to manage all administrative duties for the company as it grows at an international level, including HR, safety, and contract compliance.



CAMERON LOBATO, P.E., P.Eng. : Western Director
CAMERON LOBATO, P.E., P.Eng., Western Director

Cameron Lobato served as President and Chief Engineer of GeoStabilization's former subsidiary, GeoStabilization, Inc., since its founding in 2007. After their merger, Cameron joined the company as its Western Division Director. Cameron is responsible for all facets of geotechnical design including project management, design, design review, and logistics. He has particular expertise in construction means and methods associated with landslide mitigation adjacent to active public highways. His geotechnical construction career began in 1996 with an established Colorado design firm, where he gained over eleven years of managing and designing experience in temporary and permanent soil nail landslide stabilization, micropile walls, rockfall mitigation, tieback stabilization, and Geosynthetically Confined Soil (GCS©) retaining walls. Cameron has designed and supervised the construction of over 300 earth retention systems and rockfall mitigation projects. A native of Western Colorado, Cameron received his BS in Civil Engineering from Colorado School of Mines in Golden, CO.

Click Here to read Cameron's profile in the International Erosion Control Association's official publication.

NATHAN BEARD, P.E., M.B.A. : Eastern Director
NATHAN BEARD, P.E., M.B.A., Eastern Director

Nathan is responsible for all facets of project creation and completion for projects within the 34 eastern states, many of which are in some of our nation's most difficult terrain.  Nathan is a registered professional engineer in multiple states including California and has authored multiple papers on stabilization technology, regularly presenting workshops across the United States and Canada. A former Captain in the United States Air Force, Nathan held the position of Program Manager, Coach, and Instructor at the United States Air Force Academy; the Atlas II Program Manager at Cape Canaveral Air Force Station, Florida; and the Systems Engineering Chief at Patrick Air Force Base, Florida. Nathan was awarded United States Air Force Academy Instructor of the Semester in 2006, the Unites States Air Force Academy Newcomer Instructor of the Semester in 2005, Company Grade Officer of the Quarter twice in 2004, and the Air Force Achievement Medal for outstanding performance. Nathan attended the United States Air Force Academy, graduating with a B.S. in Civil Engineering and served at the Co-Captain of the 2000 Air Force Academy football team that over four years won 37 games, four Commander-in-Chief’s Trophies, and had three post-season bowl appearances.  Nathan lives in Destin, Florida with his wife Ashlee and children Olivia and Braxton.

Click on the links below to see Nate in the news.

WTVC-TV NewsChannel 9 Interview

WBIR-TV NewsChannel 10 Interview

Times Free Press Interview

Daniel Journeaux : Rockfall Division Director
Daniel Journeaux, Rockfall Division Director

Daniel is one of the world's leading experts on rockfall mitigation and rock slope stabilization. He has tackled some of the most technically difficult projects in the world, including projects across North America and Grenada, and has consulted on geohazard sites in India, China, and Libya. Daniel is an alumni of the Transportation Research Board's (TRB's) Engineering Geology Committee and the TRB Rockfall and Geotechnical Asset Management Subcommittees, as well as the Steering Committee for the Highway Geology Symposium. Daniel also co-authored the Rock Cut Slope and Catchment Design Guidelines for the Ohio Department of Transportation and has authored numerous articles for various trade publications during his 30+ years in the industry.



Pete MacKenzie P.G., Energy Services Director :
Pete MacKenzie P.G., Energy Services Director,

Pete is an accomplished Geologist who joins GeoStabilization with 20 years of experience in the upstream (exploration and production) energy sector, most recently as Vice President of Operations for the Ohio Oil and Gas Association. A longtime resident of Worthington, Ohio, Pete joined the United States Army out of high school as a 19D Cavalry Scout, serving at Ft. Knox, Kentucky and in an Air Cavalry Squadron of the Ohio National Guard while attending the Ohio State University, where he received a B.S. in Geological Sciences. With a love for field work, and the mantra that “the best geologist is the one who has seen the most rocks” Pete never turned down an opportunity to go to the field. Pete has worked in most of the 50 states and almost all of the continents (including a three-month stint in Antarctica). Pete has also worked in all aspects of the petroleum industry, from public independent oil and gas exploration and production to consulting and prospect generation.

Throughout his career, Pete has been a pioneering advocate of the use of 3D seismic technology to help reduce risk in the Appalachian Basin. He is responsible for the site selection and drilling of over 500 wells, and is active in the leadership of the American Association of Petroleum Geologists, where he serves as an elected member of the Advisory Council, Chair of the GEO-DC Board, Director of DataPages, Inc., and as a Trustee Associate of the AAPG Foundation.

LLOYD KUEHN, M.B.A. : Chief Financial Officer
LLOYD KUEHN, M.B.A., Chief Financial Officer

Lloyd holds a B.S. in Civil Engineering from Iowa State University and a M.B.A. in Finance from the University of Denver. He has worked for Amoco Oil Corporation as a project manager and project engineer, served as the CFO for Scott Contracting (a $75 million civil contractor), and, most recently, served as the CFO and Vice President of Finance for RK Mechanical (a $165 million Mechanical contracting/manufacturing firm). Lloyd's background in engineering and experience in project management, project engineering, and finance/accounting for construction and manufacturing firms are invaluable as he manages GeoStabilization's finance and accounting duties. Lloyd lives in Denver, Colorado with his wife Melissa and children Brady, Emilee and Jack.


Tom Szynakiewicz, M.S., P.E., D.GE, M.ASCE : Grouting and Foundation Director
Tom Szynakiewicz, M.S., P.E., D.GE, M.ASCE, Grouting and Foundation Director

Tom Szynakiewicz, holds both B.S. and M.S. degrees from the Colorado School of Mines, is a licensed civil engineer in 12 states, and is certified as a Diplomate, Geotechnical Engineering by the ASCE Academy of Geo-Professionals. Tom has over 13 years of experience designing, installing, and monitoring ground modification, earth retention, grouting, and structure stabilization systems throughout the Gulf Coast, Midwest, and Rocky Mountain Regions.  Tom's areas of expertise include Earth Retention, Landslide Stabilization, Ground Improvement, Deep Foundations, and Foundation Repair.  Additionally, Tom has extensive experience with various geotechnical construction methods including ground anchors, micropiles, soil mixing, jet grouting, compaction grouting, slurry grouting, microfine cement, and chemical grouting.

Engineering Team

MATTHEW BIRCHMIER, M.S., P.E. : Eastern Deputy Director
MATTHEW BIRCHMIER, M.S., P.E., Eastern Deputy Director

Matthew Birchmier has been an engineer for GeoStabilization performing project management and quality control functions since 2010. He began his geotechnical career and honed his geotechnical expertise through work with Terracon Consultants in Boise, ID and Phoenix, AZ. A native Iowan, Matthew graduated from Iowa State University with both Bachelors and Master of Science Degrees in Civil Engineering with a geotechnical engineering emphasis. He first became interested in landslides with his master’s research and thesis, which focused on correlating the loss in residual strength with the weathering effects on micro and macro level of material from the Pierre Shale formation. Matt has worked on projects throughout the United States with an eye for detail and design that is unparalleled in the industry.

JUSTIN D. PETERSEN, P.E. : Regional Engineer- Intermountain West
JUSTIN D. PETERSEN, P.E., Regional Engineer- Intermountain West

Justin attended the University of Wyoming and graduated in 2011 with a B.S. in Civil Engineering. Since joining the GeoStabilization International team in June of 2011, Justin has designed and managed a full array of geotechnical solutions. These systems include soil nail landslide stabilization, micropile walls, tieback stabilization, rock anchors, and geosynthetically confined soil (GCS®) retaining walls in some of our nation's most difficult terrain. Justin supports our eastern, western, and Canadian operations. With an unrelenting work ethic and admirable onsite assertiveness, Justin has proven to be a standout in the field and has quickly become the go-to engineer for many clients and field superintendents. In addition to project oversight, Justin spearheads GeoStabilization design submittals, engineering details, anchor testing, and helps oversee GeoStabilization's junior engineer and intern program. Justin, a native of Wyoming, lives in Grand Junction, Colorado.

VASCO DUKE, M.S., P.E. : Southeast Regional Engineer
VASCO DUKE, M.S., P.E., Southeast Regional Engineer

Born in Panama City, Panama, Vasco graduated with a Civil Engineering Degree from the Technological University of Panama. He then went to The University of Arizona in Tucson, AZ where he ended up completing the Master of Science in Civil Engineering program with an emphasis in geotechnical engineering. He began his career in 2003 with Terracon Consultants, and then in 2007 he joined URS Corporation where he worked in projects such as the design and construction inspection of four earthen dams for the Panama Canal Expansion project. He gained much more of his experience in the modeling of the stability of slopes monitoring the stability of gypsum stacks in the phosphate industry. He also worked in the construction inspection of drilled shaft foundations and driven pile installation.

Having worked in so many projects involving slope stability monitoring and modeling and knowing how critical earth slopes are in society, he became fascinated in using his knowledge and skills and apply them to the repair and stabilization of landslides and retaining structures. Vasco joined the GeoStabilization team in July 2013. In his spare time, Vasco enjoys spending time with his family and doing all sorts of sporting activities.

MARTY WOODARD PH.D., P.G., P.E. : Northeast Regional Engineer
MARTY WOODARD PH.D., P.G., P.E., Northeast Regional Engineer

Dr. Woodard is a professional engineer and professional engineering geologist whose experience includes investigation, design, and implementation of remediation techniques for unstable soil and rock slopes. He has significant experience in rock slope stability, rock slope rating systems, subsurface geology and geotechnical interpretation, landslide investigations, foundation analysis, and geologic reconnaissance. His expertise is in rock mass characterization, rock slope engineering and rock mechanics. Marty has a B.A in Geology from the State University of New York at Potsdam College, a M.S. in Environmental and Engineering Geosciences from Radford University (Virginia), and a Ph.D. in Engineering Geology from Kent State University in Ohio. He has authored the Rockfall Hazard Rating Matrix and Rock Slope Design Manual for the Ohio Department of Transportation. He has worked throughout the United States and South and Central America.

Derrick Hayes, M.S., P.E. : Northwest Regional Engineer
Derrick Hayes, M.S., P.E., Northwest Regional Engineer

Derrick brings over ten years of geotechnical engineering experience across a broad range of geotechnical topics. His design skill set ranges from slope stabilization, deep foundations, seismic site response, lightweight fills, to pavements. Derrick’s professional experience includes task leads for projects such as the I-5: Columbia River Crossing Bridge, Oregon DOT bridge seismic retrofit program, and numerous water/wastewater and transportation related projects. Derrick is a registered civil and geotechnical engineer in the State of Oregon and holds an MS and BS in civil engineering from Oregon State University. He enjoys spending time with his family, coaching youth sports, and trying to recapture his youth with mixed martial arts.



ADAM LEWIS, M.S., E.I.T. : Project Engineer
ADAM LEWIS, M.S., E.I.T., Project Engineer

 Adam graduated from California State University, Fullerton with a B.S. in Civil Engineering and Minor in Geology in 2011. During his undergraduate work, Adam participated in multiple research competitions achieving a 3rd place standing at California State University, Fullerton’s Student Research Competition in 2011 and a top 10 nationwide placement for accurately analyzing the axial capacity of a 160 foot pile in Geo-Prediction 2011.

Adam then went on to graduate with his M.S. in Civil Engineering focused on Geotechnical Engineering from California State University, Fullerton in 2012. His thesis work consisted of “Experimental Modeling of Sandy Slope with Simulated Rainfall and 1g Earthquake Shaking”, where he impressed industry leaders with his presentation at GeoCongress 2012. Adam also competed in the Google Map Maker competition, held Nationwide including Canada, where his team received a 3rd place standing.

After receiving his masters in Civil Engineering with an emphasis in Geotechnical Engineering from California State University, Fullerton in December of 2012 Adam beat out heavy competition and joined the GeoStabilization team permanently as a Project Engineer. In his short time with the company Adam has worked on Soil Nail, Micropile, and GCS Wall projects in AL, CA, CO, ID, KY, MT, NY, OR, PA, TN, VA, VT, and WV. Adam currently lives in Grand Junction, Colorado with his wife Stephanie.

ANDREW FERGUSON, E.I.T. : Project Engineer
ANDREW FERGUSON, E.I.T., Project Engineer

Andrew graduated from Idaho State University in December 2012 with a B.S. in Civil Engineering. During Andrew’s studies at ISU, he specialized in hydrologic and geotechnical design/analysis where he participated in projects including the Colonial Hall Foundation Analysis for the State of Idaho and the New Fun Farm Bridge Design.  Andrew first gained experience working as an engineering intern for Nexant, Inc. where he met with clients, took system measurements, and performed analysis/design on irrigation systems. He joined GeoStabilization International in 2013 as a recent graduate and has since collaborated on projects throughout the United States. As a native of Idaho, Andrew enjoys climbing, snowboarding, fishing, camping, and spending time with family and friends.

Walter Turnbull, M.C.E, E.I.T. : Project Engineer
Walter Turnbull, M.C.E, E.I.T., Project Engineer

Walter Turnbull is a Navy veteran who enlisted immediately after high school.  He served the world’s finest navy on a submarine as a “nuke”, specifically an Engineering Laboratory Technician.  Aboard the USS Philadelphia out of Groton, CT Walter was responsible for all radiological controls and maintaining the chemistry of the primary and secondary plants.  After the Navy he moved to Auburn, AL where he attended Auburn University and obtained his BS and MCE in Civil Engineering with a focus in Geotechnical Engineering.  His research was on Geosynthetically Confined Soil (GCS) walls with an emphasis on implementation of GRS-IBS, and he also ran the Undergraduate Geotechnical Lab.  He has a blue pit bull, Luna, with whom he loves to spend time outdoors.  Walter loves to do any outdoor activity involving water including diving, kayaking, fishing, and spending time with Luna at the creek.

Eric List : M.C.E, E.I.T
Eric List, M.C.E, E.I.T

Eric List grew up in Grand Junction, Colorado, and attended Colorado School of Mines, where he graduated with a B.S. in Civil Engineering and M.S. in 2014. While studying there, he focused on geotechnical analysis and design. He has experience with both field and laboratory testing and investigation. After receiving his Master’s Degree, Eric moved to Nashville, TN. He enjoys any outdoor activities and spends much of his free time outside.



Steve Harrison, E.I.T. : Project Engineer
Steve Harrison, E.I.T., Project Engineer

Steve is a graduate of the University of New Hampshire and Embry Riddle Aeronautical University and holds a degree in Civil Engineering and his pilot’s license. He worked his way through school as a lab and field technician for a small geotechnical engineering firm gaining a fundamental understanding of soil mechanics. Steve had the opportunity to design and implement a water distribution system in the Dominican Republic during his time in college as well. He enjoys flying, skiing and restoring old cars during his free time.



Scott Embry, P.E., Regional Engineer :
Scott Embry, P.E., Regional Engineer,

Scott holds a B.S. degree in Civil Engineering from Western Kentucky University and a M.S. Degree in Civil Engineering (Geotechnical Engineering) from the University of Kentucky. Scott has extensive experience in slope stability analyses, settlement analyses, external retaining wall analyses, rock cut slope design, seismic design, pavement design, and deep and shallow foundation analyses. Scott also joins GeoStabilization's long list of military veteran employees-he served as a Squad Leader in the Kentucky Army National Guard for over eight years and deployed to Iraq in support of Operation Iraqi Freedom from 2006 to 2007.

Operations Team

Wayne FEE : Operations Director
Wayne FEE, Operations Director

Wayne holds a Bachelor of Science in Construction Management from Colorado State University. Wayne worked previously at RK Mechanical, where he spent the last 16 years in various positions, most recently as the Vice President of Energy Services. During his career at RK Mechanical he managed a contracting division that performed over 70 million in annual revenues, and has performed single projects in excess of 35 million. In the last few years with RK Mechanical Wayne started a ground-up Energy Division that produced 34 million in revenue in only its second year of operations. Wayne has a strong business acumen and a wide variety of experience in scheduling, cost control, project management, strategic planning, business development, and leadership. Wayne lives in Lakewood, Colorado with his wife, Elizabeth, and their children Jack (6) and Morgan (6). In his spare time, Wayne enjoys elk hunting, fishing, mountain biking, skiing, and golf.

Dan Koehmstedt : Western Operations Manager
Dan Koehmstedt, Western Operations Manager

Dan started his construction career as a field engineer for Affholder, Inc., then Project Engineer for Kiewit Western, Inc. from 1998 until 2001. His scope of work included management of resources for Rock Bolting and blasting as well as tunneling.  From 2001 until the end of 2004 Dan was a key Project Manager for Ames Construction. This included heavy highway construction projects ranging from $1.5 mil to $10 mil and consisted of various earth retention techniques such as retaining walls and soil nails projects as well as rock bolting. After that Dan was a key Senior Project Manager at Yenter Companies, Inc. specializing in design/build specialty bolting and soil nailing and other earth retention projects as well as scaling and meshing of slopes. In January of 2013 Dan came to GeoStabilization and immediately became a key resource manager and Senior Project manager in GeoStyabilization’s Western US projects as well as advising and managing on an as-needed basis in the Eastern US as well. Dan’s creativity, work-ethic and overall knowledge of earth retention is vital to his management success.

Robin “Neil” Bullock JR. : Eastern Operations Manager
Robin “Neil” Bullock JR., Eastern Operations Manager

Neil joined the US Army straight out of high school, where he began as an US Army Ranger in the 1/75 Ranger Battalion (USASOC). After being honorably discharged he began his career in the geotechnical construction field. Neil started out as a laborer and advanced his way through the ranks to become a superintendent for one of the world’s largest geotechnical construction companies. While there he gained a vast knowledge in drilling and grouting techniques, such as multi-strand anchor installation, compaction grouting, micro pile installations and soil nail installation methods. Neil began focusing his work in the field of soil nail wall installation, an area where he excelled greatly.

Neil joined the GeoStabilization Team in 2014 as the Eastern Region Operations Manager with an extensive experience in both Geotechnical Construction and Construction Management skills. Neil manages the scheduling, equipment, and project management functions and ensures they are all tied together to allow projects to be completed on time and on budget. While not tied to the everyday constraints of work, Neil is an avid outdoorsman that enjoys hunting, fishing, and team roping. Neil Lives in Georgia with his 3 children.

SIKOT MAHAXAY : General Superintendent
SIKOT MAHAXAY, General Superintendent

Sikot Mahaxay was born in Champasack, Laos, then moved to Thailand with his family at an early age. As the eldest and only son, tradition dictated that Sikot support his family until he married. Sikot knew that if he stayed in Thailand, he would not be able to support his parents and his four sisters, so he sought sponsorship to come to the United States. A sponsor family in Lake Park, Iowa, invited Sikot to join them on their farm, and taught him the basics of equipment operation. While attending high school in Lake Park, Sikot worked as a full-time heavy equipment operator, finally making enough money to move the rest of his family to Iowa from Thailand.

Sikot has over twenty years of experience as an equipment operator, and over ten years of experience in soil nailing, GCS wall construction, and is a world-class rock mason using mortarless construction techniques. Sikot is also an expert driller and has repaired landslides across the United States. Sikot lives in Denver, Colorado. When he is not fixing landslides, Sikot enjoys outdoor sports, camping, boating, fishing, and hunting.

Ronald J. “Spike” Priestly : General Superintendent
Ronald J. “Spike” Priestly, General Superintendent

Ron “Spike” Priestly joined the U.S. Navy out of high school, where he served as a Helicopter Electrician and Search and Rescue Swimmer. A Veteran of the First Gulf War, two Southeast Asia tours, and counter-drug operations in Southern California and Baja, Mexico, Spike was honored with four Battle Efficiency Awards as well as Expert Marksmanship Ribbons. After being honorably discharged from the Navy, Spike went on to hone his equipment operation skills in the public and private sector, winning awards at the National Snow & Ice Festival and the Colorado State Fair during his time as a District Foreman with Park County, Colorado. Spike has proudly worked as a field superintendent for GeoStabilization since 2007 before being promoted to General Superintendent in 2014. He is heavily experienced in every trade that GeoStabilization offers and has traveled all over the United States repairing rockslides and landslides, rock bolting, constructing GCS walls, soil nailing, installing reinforced shotcrete, and constructing micropile walls and bearing piles. Spike has operated heavy equipment for over 20 years and has drilled in every state West of the Mississippi River (as well as many to the East).

Chris Johnson : General Superintendent
Chris Johnson, General Superintendent

Chris joined GeoStabilization International after heading Allied Contractors Inc., GeoStabilization’s former subcontractor, for over eight years. With over 25 years of experience as a superintendent, Chris has been integral in the success of many of GeoStbilization’s largest projects. In New Market, Virginia, Chris and his crew injected 2,850 Self-drilling SuperNails® on Route 820. Chris was a part of both phases of GeoStabilization’s Cross Gate Village Project in Nashville, Tennessee where 16,000 square-feet of soil nails and 10,000 square-feet of micropiles were installed. He has directly supervised various soil stabilization and foundation support and stabilization projects, installed rock bolts, micropiles, soil nails, wet and dry process shotcrete, compaction and gravity grout, and epoxy and concrete overlay systems. Chris is also a certified and experienced shotcrete nozzelman. During his career Chris has supervised individual projects in excess of 22,000 square feet, has installed well over 100,000 square feet of reinforced shotcrete, and has drilled more than 5,000 SuperNails®.

ZECH MORIARTY : General Superintendent
ZECH MORIARTY, General Superintendent

Zechariah “Zech” Moriarty served in the Army for 6 years before joining the GeoStabilization team. While in the Army he graduated top of his class in PLDC, which placed him on the Commandants List, before he graduated second in his class from Supply School. Because of his exemplary leadership skills learned in the Army, Zech was able to assume the role of superintendent after only four months with the company. During his six years as a superintendent, Zech has installed over 10,000 launched nails, 25,000 of each SuperNails® and Self-Drilling Nails, and shot over 7,000 cubic yards of concrete. Zech’s ability to balance efficiency and quality when installing our geohazard mitigation products has allowed him to grow even further within the company and earn the title of “General Superintendent” in 2014.

Frederic Sauber : General Superintendent
Frederic Sauber, General Superintendent

Fred joined GeoStabilization International with 24 years experience in construction and over 18 years of rope access work. Fred has directly supervised the completion of large-scale projects throughout the United States, Canada, and much of Europe. Along with working on multiple continents, Fred has operated virtually every specialty drill rig in the industry. With a dedication to increasing production efficiency, safety, material acquisition, and equipment maintenance, Fred is a perfect fit here at GeoStabilization. Using his extensive experience in both general construction and rockfall mitigation, Fred and his crews have made headlines for their quick response times, attention to safety, and ability to work in tough terrain.

Tim Newberg : General Superintendent (Rockfall)
Tim Newberg, General Superintendent (Rockfall)

Tim has worked in the rock slope stabilization and shotcrete industry since 1999 and joined the GeoStabilization team in 2013. He has extensive experience in rock drilling using both top hammer and down the hole hammer techniques, installing various types of steel mesh, rock scaling, bolt testing, operating a rock slusher, shooting shotcrete, working on towers and cables, installing micro piles, operating heavy equipment, air bag scaling, and boulder busting. As a General Superintendent at GeoStabilization, Tim leads his crews to complete jobs on-time, safely, and efficiently.

Project Development Team

Brian Edwards, E.I.T. : Project Development Engineer
Brian Edwards, E.I.T., Project Development Engineer

Brian is the Deputy Project Development Engineer for the State of Kentucky and will assist Paul Travis in promoting our services in the Bluegrass State.  He is a graduate of the University of Colorado, Boulder, with a Bachelor of Science in biology and Colorado State University with a degree in civil engineering. Before joining GeoStabilization, Brian worked as a highly respected engineer and geotechnical consultant on various slope stabilization highway projects. Brian and his wife, Kari, live with their son, Rhett, in Lexington, Kentucky, and he enjoys being outdoors with his family, hunting, fishing, gardening, and is an avid sports fan.

Rob Fingerson, G.E., P.E. : Project Development Engineer
Rob Fingerson, G.E., P.E., Project Development Engineer

Robert “Rob” Fingerson is the Project Development Engineer for the South Carolina, North Carolina, Virginia, and West Virginia sales territories.  Rob previously worked as a consultant and has vast experience providing mitigation solutions to typical and unusual geotechnical challenges. His areas of expertise include: rockfall hazard reduction, erosion mitigation, slope stabilization, rock anchors, and difficult site access. Rob is a graduate of California Polytechnic University, San Luis Obispo, where he earned a Bachelor of Science in civil and environmental engineering. Rob is a licensed Professional Engineer in California, Arizona, Colorado, Hawaii, Maryland, Oregon, and Utah. He also earned his Geotechnical Engineering License from the State of California and is pursing registration in Alaska after the successful completion of his arctic engineering studies. In his spare time; Rob enjoys bicycling, skiing, backpacking, plein air painting, and travel.

Corey Mislinski, P.E. : Project Development Engineer, Energy Services
Corey Mislinski, P.E., Project Development Engineer, Energy Services

A graduate of Pennsylvania State University with Bachelor of Science in Civil Engineering and an emphasis in Geotechnical and Structural Engineering, Corey has been employed within the Geotechnical Engineering Industry in increasingly challenging roles for the past seven years. A licensed professional engineer registered in Pennsylvania, Corey brings a can-do attitude with experience in construction, retaining structure design, estimating, and project management  to our Energy Services Division. Corey and his wife, Jennifer, reside in Pittsburgh, Pennsylvania, with their fifteen-month-old son Henry.

KEITH BENDER : Independent Project Development Representative
KEITH BENDER, Independent Project Development Representative

A native of Akron, Ohio, Keith Bender has over 35 years experience in construction, construction management, and construction sales. Beginning his career as a draftsman, then an ironworker, Keith put himself through college at Bowling Green State University, graduating in three years with a Bachelor of Science in Construction Management. After college, he worked in heavy marine construction, international heavy construction, segmental post-tensioned box girder bridge construction, various plant facilities & renovations, and restaurant construction, as well as construction sales. Keith has lived and worked throughout the United States, the Caribbean, Africa, Asia and the Middle East. Keith’s varied experience, insight and drive made him a perfect choice to head GeoStabilization's project development effort in the Appalachian Region. Keith lives in the Carolinas with his wife. They have two college age sons. Keith is an avid motorcyclist, enjoys playing golf, and flying.

PERRY KAIRIS, P.E. : Independent Project Development Representative
PERRY KAIRIS, P.E., Independent Project Development Representative

Perry is a registered Professional Engineer with more than 25 years of construction experience. He earned his BS degree in Civil Engineering, Magna Cum Laude, from the University of Wisconsin. Perry worked in local government serving as the Public Services Director for the City of High Point, North Carolina, for 17 years. His responsibilities included roadway and bridge maintenance, capital improvement project planning and implementation, construction administration and project management for multi-million dollar contracts, and all public works and utility management services. Perry has been an engineering Independent Consultant for over eight years including work as the design, permitting, and construction manager for various large capital improvement projects. He most recently served as an Area Manager for a large international consulting firm. Perry brings his knowledge and experience to support our clients throughout the East Coast. Perry has been married to his wife, Nancy, for almost 30 years. They have two daughters, Amanda and Ashley. Perry’s hobbies include flying, golf, and other outdoor sports.

JAMES CHINCHIOLO, B.S. : Project Development Director, CA & NV
JAMES CHINCHIOLO, B.S., Project Development Director, CA & NV

James is in charge of project development, marketing and client negotiations for GeoStabilization International in California and Nevada.  James has authored multiple papers on stabilization technology and regularly presents over 40 technical workshops, annually, throughout the United States and Canada.  Within the last 8 years James developed and managed over 50 landslide repair and rockfall mitigation projects for several state and local California and Nevada agencies and in the private sector.  A Job Order Contract (JOC) expert, James has identified and developed the use of Job Order Contracting for efficient and cost effective landslide repair and rockfall mitigation.  James attended the University of Pacific, graduating with a B.S. in Business Administration where he played Division 1 Water Polo.

J. REID BAILEY, P.E., M. ASCE, M. SAME : Senior Project Development Engineer
J. REID BAILEY, P.E., M. ASCE, M. SAME, Senior Project Development Engineer

A graduate from the University of Georgia, Reid is a civil and geotechnical contract and project management leader in charge of all aspects stabilization projects in the Southeast.  A 16+ year record of achievement and success while providing a refreshing approach to lead hard bid and design-build capital improvement programs in Southeastern United States and Guam.  Reid is a registered professional engineer in NC and Guam.



PETER BULLOCK, P.Eng., M.Eng. : Principal Engineer
PETER BULLOCK, P.Eng., M.Eng., Principal Engineer

Peter is a native of British Columbia, holds a Geological Engineering degree from the University of British Columbia with over 20 years of experience within the earth science and engineering fields.  His early days were spent primarily in the forest and mining sectors both within the corporate and consulting sectors.  Starting in 2006, Peter rounded out this experience with a 7 year stint as a Regional Geotechnical Engineer for the Ministry of Transportation in BC.

Through the years Peter has been involved with hundreds of projects that ranged from routine maintenance to multi million-dollar legacy and capital works projects.  Many of these projects were scattered across the globe and ranged from African deserts to the ice of Antarctica.  His earlier years focused on the natural hazard side of geotechnical engineering.  These hazards included landslides, slope stability and rock fall challenges.  As his career progressed, he became more interested in the structural side of engineering. This led him to complete his Masters of Engineering at the University of Saskatchewan, gained him the BC Premiers Award for Innovation and ultimately this role with GeoStabilization.  Peter now resides on Vancouver Island with his wife and 3 young boys.

Click Here to read Peter's recently published paper in The Professional Geologist.

GREG BACHMAN, P.E., P.S. : Senior Project Development Engineer
GREG BACHMAN, P.E., P.S., Senior Project Development Engineer

Greg has over 35 years of engineering and surveying experience. He has been a City Engineer, Service Director, and County Engineer supervising staffs of up to 150 with annual budgets of up to $17,000,000. While serving as Summit County Engineer, Greg was our first client to use launched soil nails in Ohio (in 2004). The greater Akron Chamber of Commerce named Greg the 2007 Summit County Public Official of the Year.  Greg was a collegiate golfer and has competed in the Boston Marathon and Hawaii Ironman Triathlon. He has a B.S. in Civil Engineering from the University of Notre Dame and a M.S. in Civil Engineering from the Ohio State University. Greg is a livelong Ohio resident, where he lives with his wife Maureen.


BRYAN WAVRA, M.S., P.E. : Senior Project Development Engineer
BRYAN WAVRA, M.S., P.E., Senior Project Development Engineer

Bryan joined the GeoStabilization in-house engineering team for the Northwest region with ten years of experience providing consulting geotechnical engineering services to a variety of public and private entities. Bryan graduated from Oregon State University with both Bachelor and Master of Science Degrees in Civil Engineering with a geotechnical engineering emphasis. Bryan first gained an interest in slope stability modeling while completing his master’s project titled “Seismic Performance of the Columbia River Levee Adjacent to the Portland International Airport” which was funded by the U.S. Army Corps of Engineers. Bryan has experience in nearly all aspects of geotechnical engineering, with particular expertise in geotechnical earthquake engineering. He is a registered civil engineer in Oregon and Washington and holds a specialty geotechnical engineering registration in Oregon. Bryan, his wife, Catherine, and their daughter Ashlyn, live in Bend, Oregon. They love traveling, spending time with family and friends, and enjoying all the recreational opportunities in Central Oregon.

Trevor Ames, P. Eng., Mining Geotechnical Services Director :
Trevor Ames, P. Eng., Mining Geotechnical Services Director,

Trevor holds a Bachelor of Engineering in Mining from Laurentian University and a technology degree in Mining Engineering from Cambrian College. Trevor has over 20 years of professional experience in the mining, quarry and civil industries. Trevor has an extensive history in managing complex rapid response on-site projects and providing technical solutions to critical issues. His background includes specialized knowledge in blasting and explosives application techniques.

Trevor was previously involved with ground and Highwall stability techniques at various aggregate and open pit operations in Canada, Australia and USA. He’s managed countless technical client projects, focused on risk mitigation, productivity optimization, open pit geotechnical assessments and developed innovative designs incorporating new blasting techniques and procedures.

His operations and engineering knowledge extends into the Canadian Oil Sands, Base and Precious Metals and Coal markets where he was accountable for rolling out mine planning, development and production, mine infrastructure, ore control, technical guidance and support for Mine operations, Engineering projects, Safety initiatives, as well as reclamation and regulatory permitting. He is a licensed Professional Engineer, certified Lean Six Sigma Black Belt and ICAM Risk Management Certified.

Trevor lives in Denver, Colorado with his wife Tess, their daughter Cedar and son Aven.

Click Here to read Trevor's recent article in Pit and Quarry Magazine.

FRANK AMEND, P.E. : Director of Materials and Products
FRANK AMEND, P.E., Director of Materials and Products

Frank Amend, P.E. holds a B.S. in Marine Engineering with honors from the United States Merchant Marine Academy in Kings Point, NY.  A licensed Professional Engineer in the state of Virginia, Frank has a very diverse background in sales, engineering, marketing, and supply chain management and comes from Geobrugg North America where he was their Southeastern Regional Sales Manager for the United States.  As an author and presenter of numerous technical papers in the field of rockfall mitigation, slope stabilization, and debris flow, Frank brings a wealth of experience to GeoStabilization. Frank also serves as an invited member of ASTM's Committee D18 on Soil and Rock, helping to develop specifications for the products used in the geotechnical construction industry.

Frank lives in Rocky Mount, North Carolina with his wife Mel, while their daughters Hannah and Julia call Raleigh, North Carolina their home.

W. Chris Thompson, P.E., P.L.S. : Independent Project Development Representative
W. Chris Thompson, P.E., P.L.S., Independent Project Development Representative

Chris is a Professional Engineer and Professional Land Surveyor in North Carolina where he served as a public servant for over 30 years. Chris earned his BS in Civil Engineering from NC State University in 1983. His years of public service afford him the experience and understanding of tackling projects of all sizes and complexities as he managed a department of 300 personnel with an operating budget of over $42 million and a capital budget over $200 million. His public service years began with the NCDOT where he learned contract administration and construction standards for roadways and bridges. He spent over 25 years with the City of High Point, NC where he worked in design, construction management, and directing operations for solid waste, water and sewer utilities, and street maintenance.
Married to his childhood sweetheart, Kimberly, for nearly 30 years, Chris enjoys his family with two sons, Kyle and Clay. He also enjoys sports and the outdoors.


With over 30 years of experience, Paul holds a B.S. degree in Civil Engineering (Mining Engineering Option) from the University of Kentucky. He worked for the Department of Surface Mining (Coal Permit Division) and the Kentucky Transportation Cabinet (KYTC), Department of Highways, before retiring from government service. Paul has held a diverse set of duties throughout his career including serving as a Branch Manager in approving/permitting coal mine applications; a design engineer in the Abandoned Mine Lands program; working in the design section at KYTC, District 7 office; serving as Resident Engineer over several I-75 widening projects through Madison and Rockcastle Counties in Kentucky; and finally as a KYTC Maintenance Engineer.

Project Management Team

Wentz Wensel, P.E. : Sr. Project Manager
Wentz Wensel, P.E., Sr. Project Manager

Wentz has worked in construction his entire life, pushing brooms and mixing concrete with his dad since age seven. Born and raised in Idaho, Wentz moved to Golden CO in 2004 to attend the Colorado School of Mines. He holds a Bachelor’s degree in civil engineering, a Master’s degree in geotechnical engineering, and is a registered professional engineer in the state of Colorado. After college, he spent five years with Hayward Baker as a field engineer, project engineer and project manager, working on numerous ground improvement and earth retention projects. Wentz is highly experienced in the planning, organization, and management of complex, large-scale geotechnical construction projects. In his free time, he enjoys running, golfing, hunting, and flying.

Matt Swoboda : Project Manager
Matt Swoboda, Project Manager

Matt Swoboda is a seasoned construction industry veteran with over 17 years experience; 15 years in heavy civil/utilities construction – primarily in the fields of charge of estimating, budgets, and project management.. Matt earned a Bachelor of Science degree in Business Administration from the University of South Alabama and a Master’s Degree in Public Health from the University of Southern Mississippi. Matt joined GeoStabilization in 2013 and is currently the Southeastern Regional Project Manager.


Noel Philippon : Project Manager
Noel Philippon, Project Manager

Noel has more than 26 years in the construction industry, with 20 in rock/slope stabilization. He has experience in full on-site project management; effectively scheduling, monitoring, and inspecting all work from start to customer orientation. He works effectively with engineers, developers, and public officials.



Brent Leverett : Project Manager
Brent Leverett, Project Manager

Brent was a graduate research assistant at Michigan State University before working at a large geotechnical construction firm where he gained a wealth of experience as a Field Engineer, Project Engineer, and then as a Project Manager. Brent was involved in various projects that utilized the following technologies: Earth Retention / Excavation Support (anchors, soil nailing, underpinning, soldier beam and lagging), Grouting (jet and compaction grouting), Piles (jacked/helical piles, micropiles, augercast piles), and Vibro (compaction).

Brent has extensive experience with bidding, design, testing, field QA/QC, and management of deep foundation, earth retention, and ground improvement projects.  He graduated from Michigan State University with both Bachelors and Masters degrees in Civil Engineering and currently resides in Michigan.