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Brandon Steets, P.E.

Brandon Steets, P.E., is a Senior Principal Engineer based in California with more than 20 years of experience in National Pollutant Discharge Elimination System (NPDES) and Total Maximum Daily Load…

William Steier, P.E.

William Steier is a Principal Engineer based in Maryland with more than 20 years of experience in civil engineering, environmental remediation, and solid waste engineering.

Olga Stewart, P.E., PMP

Olga Stewart is a Senior Environmental Engineer based in Alaska with more than 13 years of experience focused on site characterization of contaminated sites; conceptual site model development and refinement;…

Tim Strowbridge, MSOE IPlantE

Tim Strowbridge, MSOE IPlantE, is a Principal Process and Environmental Consultant based in the United Kingdom with more than 30 years of experience as a process and project engineer. He…

Eric Suchomel, Ph.D., P.E.

Eric Suchomel is a Senior Principal Environmental Engineer based in California with more than 15 years of academic and professional experience focused on remedial program management, site investigation and characterization,…

James Stout, BCES

Jim Stout is a Senior Principal Environmental Scientist based in Texas with more than 31 years of experience focused on the effective management of environmental remediation projects for private and…

Ken Susilo, P.E., D.WRE

Ken Susilo is a Senior Principal Water Resources Engineer based in California with more than 25 years of experience focused on integrated urban stormwater management.

Will Tanner, P.E.

Will Tanner is a Principal Engineer based in Georgia with more than 16 years of experience focused on geotechnical and geostructural engineering and construction. His practice has evolved around a…

E. Onur Tastan, Ph.D., P.E.

Onur Tastan is a Principal Geotechnical Engineer based in North Carolina with more than 13 years of experience focused on geotechnical and geostructural engineering including field investigation, analysis, design, and…

Bailey Theriault, P.G., L.G.

Bailey Theriault is a Principal Geologist based in New Hampshire with more than 14 years of experience focused on geohazard assessment and management for oil and gas clients.

Jeffrey Thompson, Ph.D., P.G., C.Hg.

Jeffrey Thompson is a Principal Scientist based in California with more than seven years of experience applying computational methods to site characterization and remediation. He has served his clients in…

Shanna Thompson, P.E.

Shanna Thompson is a Principal Environmental Engineer based in Georgia with more than 19 years of experience focused on site investigation, remediation design, and remediation system operation. She has performed…

Danielle Thorson, P.E.

Danielle Thorson is a Senior Engineer based in Ontario with more than 15 years of experience in environmental consulting.

Gordon Thrupp, Ph.D., P.G., CHG

Gordon Thrupp is a Principal Hydrogeologist based in California with more than 25 years of experience focused on evaluating geological and hydrogeological conditions. He has specialized in quantitative analysis of…

Eric Tollefsrud, P.G.

Eric Tollefsrud is a Principal Hydrogeologist based in Minnesota with more than 25 years of environmental consulting experience focused on the characterization and remediation of soil, soil vapor, and groundwater…

Eryn Torres

Eryn Torres is a Senior Professional based in California with ten years of experience focused on subsurface analysis, including geological, hydrogeological, and chemical evaluations to support remediation, groundwater sustainability, and…

Denise Tripp

Denise Tripp is a Senior Consultant based in Massachusetts with more than 35 years of experience focused on environmental assessment and remediation and litigation support for clients in the paper,…

Jeffrey Tyburski, P.G.

Jeffrey Tyburski is a Principal Geologist based in North Carolina with more than 32 years of experience focused on environmental brownfields redevelopment solutions to support property due diligence and acquisition,…

Thomas Vainio-Mattila, PGeo., EurGeol.

Thomas Vainio-Mattila is a Principal Environmental Consultant based in Ireland and with more than 25 years of experience focused on environmental consulting in Ireland, the UK and Germany.

Brian Valleskey, CFM

Brian Valleskey is a Senior Professional based in Wisconsin with more than 20 years of experience in water resources initiatives related to dam safety, compliance, permitting, analysis, and removal.

Lisa Van Tassell, P.E.

Lisa Van Tassell is a Senior Principal Environmental Engineer based in California with more than 15 years of experience focused on soil and groundwater remediation systems; site investigation and characterization,…

David Vance, P.G.

David Vance is a Principal Geologist based in Georgia with more than 18 years of experience restoring riverine and coastal systems.

Matt Vanderkooy, P.Geo

Matt Vanderkooy is a Senior Contaminant Hydrogeologist based in Ontario with more than 10 years of experience focused on complex multidisciplinary challenges with a specialization in managing and directing per-…

Patrick VanDeWiele, P.E.

Patrick VanDeWiele is a Project Engineer based in Missouri with more than 12 years of experience in civil engineering, water resources, dams, and levee projects.

Spencer D. Varnado

Spencer Varnado is a Senior Scientist based in Louisiana with more than 16 years of experience in environmental permitting and planning, ecological surveys, ecological restoration, and project management.

Srinivasa Varadhan, Ph.D., P.E., PEng

Srini Varadhan is a Principal Environmental Engineer based in Ontario, Canada with more than 12 years of engineering, research, and consultation experience focused on large-scale and complex soil and groundwater…

Jesse Varsho, P.E., P.G.

Jesse Varsho is a Principal Engineer and Geologist based in Illinois with more than 19 years of experience in environmental consulting, landfill engineering, construction quality assurance, permitting, compliance, and project…

Robert Veenstra

Robert Veenstra is a Principal Environmental Consultant based in Missouri with more than 30 years of experience focused on developing and managing complex soil, groundwater, surface water and sediment investigation…

Berend Velderman, P. Geo

Berend Jan Velderman is a Senior Consultant based in Ontario with more than 30 years of experience in a variety of environmental projects including assessment and remediation of contaminated sites,…

Curt Walker

Curt Walker is a Senior Consultant based in Knoxville with more than 30 years of experience focused on developing, directing, and implementing ex situ and in situ remediation technologies, often…

Scott C. Walker

Scott Walker is a Senior Principal Ecologist based in Texas with more than 22 years of experience in project management, environmental impact assessment, ecological restoration, and environmental permitting and planning.

Annika Wallendahl, P.E., L.G., MBA

Annika Wallendahl is a Principal Engineer based in Washington with more than 20 years of experience focused on energy transition, environmental compliance, sustainability, and environmental engineering.

James Wang, Ph.D., P.E.

James (Yu-Sheng) Wang is a Principal Environmental Engineer based in Maryland with more than 23 years of experience focused on developing and applying innovative assessment and remediation technologies. James has…

Kevin M. Warner, P.E.

Kevin Warner is a Principal Engineer based in Florida with more than 35 years of experience designing and implementing soil and groundwater treatment systems at hundreds of sites throughout the…

Nandra Weeks, P.E.

Nandra Weeks is a Senior Principal Environmental Engineer based in Florida with more than 30 years of professional experience focused on the engineering and remediation issues associated with environmentally-impaired property…

Gary Wealthall, Ph.D.

Gary is the Managing Director of Geosyntec’s consulting business in the UK and Ireland. He is a Senior Principal with more than 25 years of experience in contaminant hydrogeology research…