The professional commitments of Brierley Associates have been fostered by the partners over many years. All of us at Brierley Associates, share a common business vision; one that is dedicated to the service of our clients.

Corporate Management Staff | Regional Managers | Senior Consultants | Senior Staff

CORPORATE MANAGEMENT STAFF

Dr. Gary S. Brierley, P.E.  – President (Littleton, CO Office)

Dr. Brierley has more than 40 years of experience working with major underground projects, he is considered an industry expert in tunnel design and construction, geotechnical reports for underground construction, and risk management in the heavy civil construction industry.

Dr. Arthur "AJ" McGinn, P.E.  – CEO (Syracuse, NY Office)

Dr. McGinn has more than 15 years of experience and is widely respected as an expert in the areas of numerical ground modeling, particularly in connection with ground modification methods such as soil mixing and jet grouting.

Gregg Sherry, P.E. – Vice President, Tunneling Manager (Littleton, CO Office)

Mr. Sherry has over 30 years of experience in design and construction of civil engineering projects including dams, water projects, tunnels, transportation projects, railways, pipelines, and canals. He is a specialist in underground engineering, and groundwater hydrology.

Steven Kuehr, P.E. – COO (Denver, CO Office)

Mr. Kuehr has over 30 years of geotechnical engineering. He specializes in geotechnical engineering as it relates to water supply, sewerage, water resources, commercial, industrial, highway, bridge, and land development projects.  He has technical expertise in foundation engineering, slope stability, expansive soils, ground modification, retaining walls, landslide evaluation and repair, embankment dam design and groundwater collection trenches and cutoffs constructed by the slurry trench method.  

Alan L. Howard, P.G., C.E.G.  – Vice President (Moraga, CA Office)

Mr. Howard has more than 24 years of experience, and specializes in tunneling, geotechnical investigations, hydrogeology, geohazard evaluations, rock mechanics and aggregate mine zoning and permitting.

Dr. Eric Lindquist, P.E. – Director of Engineering (Moraga, CA Office)

Dr. Lindquist has 16 years experience in the design of heavy construction facilities for owners, engineers, and contractors, with an emphasis on underground structures. He specializes in the geotechnical engineering, rock mechanics, designs involving excavation shoring, slope repairs, tunnels, shafts, trestles, retaining walls, cofferdams, shallow and deep foundations, and pipelines.  He can design a variety of primary supports for tunnels and shafts, including steel ribs, liner plates, jet grout, rock bolts, and shotcrete.  

REGIONAL MANAGERS

Dr. Russell "Russ" Jernigan, P.E., P.G. - Texas Senior Project Manager (Round Rock, TX Office)

Dr. Jernigan has more than 27 years of experience in soil and rock mechanics, tunnel design, dam design and hydroelectric matters.

Bill Zietlow, P.E.  – Colorado Senior Project Manager (Littleton, CO Office)

Mr. Zietlow has worked in geotechnical engineering for 14 years and specializes in design of earth support systems for tunnels, shafts, road cuts, and temporary excavations such as soil nail, tieback, sheet pile, soldier pile, and micropile walls.  He has also designed deep foundations and landslide stabilizations.  He primarily provides design services for specialty contractors on design-build projects but has also provided geotechnical designs for public and private owners, primarily on transportation and utility works.

Todd Kilduff, P.E. – Senior Project Manager (Hoboken, NJ and Denver, CO Office)

Mr. Kilduff has over 15 years of experience specializing in underground design and construction with a strong emphasis on Tunneling and Trenchless Technologies.  His project experience has led him to develop extensive knowledge on the design of small and large diameter tunnels, temporary excavation support systems, seepage and groundwater analysis, slope stability analysis, ground improvement techniques, foundation design and the implementation of geotechnical instrumentation for performance monitoring.  These skill sets have been applied to several projects related to the construction of tunnels, utilities, wastewater treatment plant facilities, earth dam projects, building construction and transportation projects.

Robin Dornfest, P.G., C.P.G. – Senior Project Manager (Fort Collins, CO Office)

Mr. Dornfest has over 10 years of experience in geotechnical engineering, engineering geology, geologic mapping, slope stability, expansive soils, ground modification, earth retention systems, landslide and rock fall evaluation and mitigation, embankment dam design, and groundwater control systems including slurry walls and dewatering well systems. In addition, Mr. Dornfest has provided third party review services to several municipalities, provided environmental services, served as an expert witness, and regularly provides value engineering to numerous client and project types.

Phillip "Phil" Burgmeier, P.E. - Senior Engineer (Syracuse, NY Office)

Mr. Burgmeier has 15 years of experience in the geotechnical engineering field providing design services for private and public owners and contractors with primary emphasis on underground construction, foundation and underpinning support, and landslide remediation.  He also specializes in structural and geotechnical designs to support underground construction projects.  In addition has extensive experience in providing re-time conflict resolutions that can help keep project on track for demanding project schedules.

Jay Perkins, P.E.  – Senior Project Manager (Boston, MA Office)

Mr. Perkins has more than 20 years experience as a geotechnical engineer specializing in the management of geotechnical and multi-disciplined projects at the local, national and international levels.  This management experience includes coordinating the various civil engineering disciplines to complete the necessary deliverables and contract documents for bidding within a given budget.   Technical experience encompasses supervising geotechnical investigations and instrumentation programs, providing design recommendation of commercial and industrial buildings, earth embankment dams and slopes, landfills, cutoff walls, wastewater treatment facilities, horizontal construction; and the application of geosynthetic materials.

Joseph Wiedemann, P.E. – Regional Manager (Elgin, IL Office)

Mr. Wiedemann has 28 years of design-build experience in highway, civil and commercial building construction and rehabilitation. He has managed multiple ongoing projects for Regional and National firms across the U.S. His project experience includes marketing, specification writing, bidding and estimating, design and engineering analysis, safety planning, training and assurance, and construction quality assurance.  

Nate Soule, P.E., P.G. – Senior Engineer (Denver, CO Office)  

Mr. Soule has 7 years of experience in a variety of tunneling, geotechnical, and geological engineering projects. His focus is primarily on tunneling and trenchless engineering and is also involved with more traditional geotechnical projects.  Additional areas of experience include cementatious grouting and support for hard-rock aggregate quarries.  

Nick Stater, P.G. – Senior Engineering Geologist (Bedford, NH Office)  

Mr. Strater has over 16 years of engineering geology and geotechnical consulting experience.  His specialties include rock and soil tunnels, horizontal directional drilling, rock slope design and remediation, rock blasting, and forensic geology.

SENIOR CONSULTANTS

David Berti, P.E., S.E. – Senior Consultant (Moraga, CA Office)

For the past 29 years, Mr. Berti has been an engineering consultant to owners, contractors, and engineers for the design of heavy construction facilities. His design experience includes tunnels, shafts, land and marine cofferdams, pipe jacking and microtunneling, subway construction, caissons, retaining walls, open excavations, powerhouses, temporary dams, equipment trestles, temporary railroad and highway bridges, permanent bridge foundations, temporary bridge shoring supports, concrete falsework, work platforms, rigging, pipelines (hydraulic and structural), temporary excavation shoring, permanent slope repair, and demolition of various structures. Prior to becoming a consulting engineer, Mr. Berti was a project and field engineer and survey party chief for two heavy construction contractors building the subway system in Washington, D.C. He is a registered Civil Engineer in numerous states and a registered Structural Engineer in California.

Brian C. Dorwart, P.E., P.G. – Senior Consultant (Bedford, NH Office)

Mr. Dorwart has more than 30 years experience in heavy civil projects and specializes in horizontal directional drilling projects.  He has a wide range of project experience with underground utilities and transportation tunnels and drills, slope assessment and remediation, storm water system design, shoreline stabilization, and the interaction of subsurface conditions on construction activities. In addition, Mr. Dorwart has served as technical expert to contractors and owners for claim negotiation and remediation.

Dr. Ray Henn, P.G. – Senior Consultant (Denver, CO Office)

Mr. Henn has more than 40 years of heavy and underground construction experience with a concentration in shafts and tunneling, hydroelectric, water and wastewater, and transportation projects on projects ranging in value from $2M to $1B.  He is considered an expert in Grouting Techniques.  Mr. Henn is responsible for tunnel and underground engineering, contractor support and construction management services.  Additionally, Mr. Henn has served on 29 Dispute Review Boards and as an Arbitrator on construction cases.  

Tracy Lyman, P.E., P.G. – Senior Consultant (Denver, CO Office)

Mr. Lyman has over 35 years of progressive experience in geological and geotechnical engineering specializing in rock and soil engineering and hydrogeology.  He has applied this expertise to a variety of tunneling, water and wastewater infrastructure, trenchless technology, highway and bridge, mass transit, water development, hydroelectric, power, mining, and industrial waste management and remediation projects throughout the United States and abroad.

Bruce Weber, P.E. – Senior Consultant (Elkhorn, WI Office)

Mr. Weber has 40 years of consulting experience in the geo-environmental field. He has managed engineering, exploratory drilling and construction materials testing operations for Regional and National firms. His project experience includes planning and implementation of investigation programs, engineering analyses and design and quality assurance testing.  In addition, Mr. Weber has forensic experience on a variety of issues, including differing site conditions.  

Lewis Yates, P.E. – Senior Consultant (Austin, Texas Office)

Mr. Yates has over 36 years of experience in geotechnical engineering.  During his career, he completed thousands of engineering assignments involving all aspects of geotechnical engineering throughout Texas.  He served as principal investigator on the following projects involving Earth and Concrete Dams, Machine Drilled Tunnels and Open Cut Excavations, Bridges, and Water and Wastewater Treatment Facilities.  Mr. Yates has also served as an expert witness for a variety of cases.

SENIOR STAFF

Rebecca "Becky" Brock, P.E. – Senior Engineer (Denver, CO Office)

Ms. Brock has over 10 years of experience conducting geotechnical and geologic evaluations for slope stability, retaining walls, shallow and deep foundations, roadways, and pipelines. Ms. Brock can perform project administration and management tasks, provides supervision of staff-level engineers and geologists, reviews laboratory results, project plans, and specifications.

Dr. Mohamed Gamel, P.E. – Senior Project Engineer (Savoy, IL Office)

Dr. Gamal has over 21 years of service in the geotechnical, structural, and transportation engineering fields.  Dr. Gamal’s specializes in computational studies for pavement performance, slope and retaining wall stability, deep foundations, underground excavations, ground movement behavior, and other geomechanic analyses.  In addition he helps our clients with forensic analyses of pavement failure; geo-construction difficulties associated with building damage and geotechnical field and laboratory investigations. 

Sean Harvey, P.G. – Senior Engineering Geologist (Moraga, CA Office)

Mr. Harvey is a licensed professional geologist with over 10 years of experience in geotechnical and geologic engineering applications for tunneling, mining, and commercial construction.  He specializes in tunnel design and construction, initial support design and evaluation, rock mechanics, geotechnical investigations, geologic interpretation, and construction observation.

Benny Siljenberg, P.E. – Project Engineer (Denver, CO Office)  

Mr. Siljenberg has 5 years of experience in a variety of geotechnical projects. He has worked in various capacities including construction observation and testing, geotechnical surface and subsurface investigations, preparation of engineering design reports, contract documents and specifications, laying out trenchless crossings and assisting with tunneling projects. Mr. Siljenberg has worked on geologic engineering projects which involve mapping of local seismic hazards by way of identifying active and dormant landslides and logging and sampling of test pits and boreholes.  He has also assisted with forensic tunneling projects including review of construction records and analyzing them against standard practice of the industry. 

Nicholas “Nick” Strater, P.G. - Senior Engineering Geologist (Bedford, NH Office)

Mr. Strater has over 16 years of engineering geology and geotechnical consulting experience.  His specialties include rock and soil tunnels, horizontal directional drilling, rock slope design and remediation, rock blasting, and forensic geology.