Who We Are

At Brierley Associates, we deliver intrinsic, recognizable value to our owner, A/E firm, and contractor clients by focusing on constructability, efficiency and practicality. Our geotechnical and structural design and consulting services are founded on a keen understanding of our clients’ needs, subsurface conditions, site-specific constraints, and the risks associated with the construction of tunnels, underground facilities and heavy civil infrastructure projects. We strive to make clients glad that they came in contact with our firm.

All of us at Brierley Associates, share a common business vision; one that is dedicated to the service of our clients, as we “Create Space Underground”.

AJ McGinn Tunnel Shaft Design Numerical Modeling ForensicArthur “AJ” McGinn, Ph.D., P.E. – President, CEO (Syracuse, NY Office) with over 25 years of working on a variety of complex projects, 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 Tunnel Design EngineerGregg Sherry, P.E. – Founding Principal (Denver, CO Office) has over 40 years of experience in design and construction of over 200 tunnels and a variety of civil engineering projects including; dams, water conveyances, transportation corridors, railways, pipelines, and canals. Gregg has also been responsible for design and construction management of various ground improvement programs involving; compaction grout,chemical grout, cement grout and jet grout
Alan Howard Tunnel Geologist Alan L. Howard, P.G., C.E.G. – Founding Principal (Denver, CO Office) has worked on numerous underground projects including; planning,design CM, and construction services for soft ground and hard rock tunnels, during his career spanning more than 40 years. Mr. Howard is a specialist in geotechnical contract documents for tunneling. In addition, Alan is well experienced in geotechnical investigations, hydrogeology,rock mechanics evaluations and claims support.
Nancy Nuttbrock COO Texas Regional ManagerNancy Nuttbrock, Chief Operations Officer (Austin and Houston TX Offices) has developed a well-rounded career spanning over 20 years in tunneling and underground development; engineering and regulatory expertise relative to the mining industry; high-level project management and successful leadership. Nancy brings a unique perspective gained from her tenure with Wyoming Department of Environmental Quality (DEQ) where she served as the Administrator of the Land Quality Division and Deputy Director of Wyoming’s DEQ.
Eric Lindquist Engineering Director Geostructural Ground ImprovementEric Lindquist, Ph.D., P.E. – Director of Engineering (Moraga, CA Office) has almost 30 years 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.
Ike Isaacson Tunnel EngineerMr. Jon (Ike) Isaacson, GE, CEG, PE, PG – Tunnel Sector Leader (Milwaukee,WI and Chicago, IL Offices) brings interdisciplinary knowledge and over 15 years’ experience as a consultant, owner’s representative, and tunnel contractor. He has been responsible for the execution of numerous land and off-shore geotechnical investigations, and mapping programs for tunnels and dams. Additionally Ike’s experience includes: tunnel construction, inspection and rehabilitation, ground freezing, grouting, and hyperbaric interventions.
Charles Luxford Geostructural EngineerCharles Luxford, P.E., S.E., P.Eng. – Contractor Support Sector Leader (Austin, TX Office) spent 15-years with Kiewit Engineering Co. in a design and management role prior to joining Brierley Associates. His construction and structural engineering experience consists of design, detailing and field support of a variety of heavy civil works including: earth retention & cofferdams, falsework & formwork, erection & demolition sequencing, shallow & deep foundations, multiple crane lifts, customized rigging, rebar cage handling, access platforms, marine operations and trestles.
Nick Strater Trenchless Design Leader Nick Strater, P.G. – Trenchless Sector Leader (Bedford, NH Office) has over 20 years of engineering geology and geotechnical consulting experience. His specialties include: rock and soil tunnels; trenchless designs ranging from horizontal directional drilling to pilot tube auger bore;rock slope evaluation and stability; rock blasting and, forensic geology.
Mohamed Gamal Abandoned Mine Lands Sector LeaderMohamed Gamal, PhD, PE – Abandoned Mine Lands Sector Leader (Denver, CO Office) has over 30 years of experience in geotechnical, structural and underground engineering , 3D finite element modeling, tunnel liner design and forensic studies. Dr. Gamal’s understanding of ground behavior is essential to leading effective mine subsidence investigations to assess the mechanics associated with subjacent mine conditions and development of at-surface and subsurface mitigation measures such as up-stage grout backfilling.
Steve Kuehr Geotechnical Engineer Dams Slurry WallsSteven Kuehr, P.E. – Geotechnical Sector Leader (Denver, CO Office) specializes in geotechnical engineering for water supply, sewerage, water resources, commercial, industrial, highway, and bridge projects. With a career spanning more than 35 years, Steve has worked on all aspects of foundation engineering, slope stability, expansive soils problems, ground modification, retaining walls, landslide evaluation and repair, dam design and groundwater collection trenches and slurry wall design.
Jake Koelliker BIM/Virtual Design and Construction LeaderJake Koelliker – BIM/Virtual Design and Construction Leader (Kanab, UT Office) and our BIM/VDC Team collaborates with clients to efficiently design solutions for complex engineering projects. Jake specializes in developing 2D/3D engineered solutions for complex challenges associated with underground construction in dense urban cores.

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New Hampshire

New York







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