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Geosyntec has built a record of successful client service by attracting some of the most creative scientists and engineers from the graduate programs of leading universities around the world.

We retain staff by providing challenging projects and a management and professional development infrastructure to support innovation on behalf of clients. We also provide staff with ownership opportunities and other financial incentives that create continuous personal links between client service and corporate well-being.

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Alphabetical List of Senior Practitioners

Paul J. Sabatini, Ph.D., P.E., D.GE. is a Senior Principal with Geosyntec Consultants in their Oak Brook, Illinois office. He has been a practicing engineer for 22 years and has…
Eric Sager is a Principal Geologist based in Florida with over 20 years of experience working collaboratively to build project teams that solve complex problems and meet client expectations. His…
Rodolfo Sancio is a Senior Principal Geotechnical Engineer based in Houston, Texas with more than 20 years of experience focused on geohazard management (i.e., identification, characterization, and mitigation of geohazards),…
Thierry Sanglerat is a Senior Principal Civil Engineer based in California with more than 30 years of consulting experience focused on groundwater and soil remediation, brownfield site redevelopment, waste management,…
Christopher Saranko is a Principal Senior Board-Certified Toxicologist based in Georgia with more than 15 years of experience focused on evaluating potential risks associated with exposures to chemicals in the…
Bruce Sass is a Senior Consultant based in Ohio with more than 20 years of experience focused on the development and implementation of chemical process improvements and environmental remediation technologies.…
Daniel Schauer is a Senior Principal Geologist based in Florida with more than 34 years of geological, hydrogeological, and geotechnical engineering consulting experience focused on multidisciplinary engineering contracts for federal,…
John Seymour is a Senior Principal Civil Engineer based in Illinois with over 30 years of experience focused on site remediation, deep foundation engineering, and construction management. His clients include…
Scott Sheridan is a Senior Principal Civil and Geotechnical Engineer based in Virginia with more than 15 years of experience focused on providing professional engineering, construction management, and consulting services…
Saverio Siciliano is a Principal Consultant based in California with more than 20 years of experience in geo-engineering focused on solving municipal and private client's problems dealing with site subsurface…
Eric Smalstig is a Senior Principal Engineer based in California with more than 25 years of environmental consulting experience focusing on industrial facilities (production and waste management) assessment and remediation,…
Ken Smith is a Senior Principal Hydrogeologist based in Pennsylvania with more than 32 years of experience managing client liabilities and remediation in multiple states and under varying regulatory conditions.…
Margaret "Poppy" Staub is a Senior Principal Consultant based in Colorado with more than 20 years of experience focused on environmental compliance, Superfund site management, pollution prevention practices, and management…
Brandon Steets is a Senior Principal Engineer based in California with more than 19 years of experience specializing in National Pollutant Discharge Elimination System (NPDES) and Total Maximum Daily Load…
Eric Suchomel is a Principal Environmental Engineer based in California with more than 10 years of professional experience focused on remedial program management, site investigation and characterization, feasibility study preparation,…
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…
Scott Struck is a Principal based in Colorado with more than 15 years of experience focused on planning, design, and implementation of stormwater infrastructure and watershed management to meet drainage…
Ken Susilo is a Senior Principal Water Resources Engineer based in California with more than 20 years of experience focused on urban stormwater management. Ken specializes in the development of…
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 is a Principal Hydrogeologist based in Minneapolis with more than 25 years of environmental consulting experience focused on the characterization and remediation of soil, soil vapor, and groundwater…
Keith Tolson is a Senior Principal Environmental Scientist based in Florida with more than 15 years of experience focused on environmental sciences. He Specializes in the application of risk-based principles…
Denise Tripp is a Senior Consultant based in Massachusetts with more than 30 years of experience focused on environmental assessment and remediation and litigation support projects for the paper, petroleum,…
Paul Tschirky is a Senior Principal Coastal Engineer based in Louisiana with more than 20 years of experience in coastal resiliency, restoration, and water management.
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,…
Jesse Varsho is a Principal Engineer and Geologist based in Illinois with more than 15 years of experience in environmental consulting, landfill engineering, construction quality assurance, permitting, compliance, and project…
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 and sediment investigation and remediation…
Joe Volpe is a Principal Hydrogeologist based in Georgia with more than 30 years of diverse experience in all aspects of water management.
James (Yu-Sheng) Wang is a Principal Environmental Engineer based in Maryland with more than 18 years of experience focused on developing and applying innovative assessment and remediation technologies. James has…
Gary Wealthall is a Senior Principal Consultant based in United Kingdom with more than 25 years of experience focused on contaminant hydrogeology research and practice. He advises regulatory authorities and…
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…
Susan Welt is a Principal based in Massachusetts with almost 20 years of experience focused on the investigation and remediation of industrial sites, former manufactured gas plants (MGP), mining operations,…
Chuck Whisman is a Senior Principal Engineer based in Pennsylvania with more than 23 years of professional experience focused in the areas of soil and groundwater assessment/remediation, system optimization, compliance,…
Jimmy Whitmer is a Senior Principal Geologist and Hydrogeologist based in Georgia with more than 30 years of experience directing multidisciplinary projects focused on water supply development, site characterizations for…
Geosyntec Consultants
Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural resources, and civil infrastructure.

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