Our People

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.

Found 449 Results
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Jean Zodrow, PhD


Jean Zodrow, PhD, is a Principal Scientist based in Colorado with more than 18 years of experience focused on toxicology, ecological risk assessment, site characterization, regulatory guidance, and risk-based screening criteria and ecological risk assessment of per- and polyfluoroalkyl substances (PFAS).

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03/21/2023

Stephanie Zinn


Stephanie Zinn is a Principal Professional Water Resources Consultant based in California with more than 15 years of experience in National Pollutant Discharge Elimination System (NPDES) water-quality compliance, multi-benefit water-supply solutions, remote-sensing research, and water-resource policy.

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09/04/2025

Yonas Zemuy, PE


Yonas Zemuy is a Senior Principal Engineer based in California with more than 20 years of experience focused on geoenvironmental and civil infrastructure projects. His projects often include landfill design, expansion, and closure; geosynthetic liners; construction engineering support and quality assurance; geotechnical investigations and testing; regulatory support; and project management.

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04/16/2026

Peter Zeeb, PhD, PG


Peter Zeeb is a Senior Principal Hydrogeologist based in Massachusetts with more than 25 years of experience focused on investigation and remediation strategy at some of the most challenging sites in the country, including CERCLA-regulated sites in New England and the Midwest, as well as numerous state-regulated sites. Peter also serves as Chair of Geosyntec’s Board of Directors.

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10/13/2013

Rachel Zajac-Fay


Rachel Zajac-Fay is a Senior Scientist based in Florida with 17 years of experience focused on ecotoxicology, ecological risk assessment, contaminated site assessments, and emerging contaminants.

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04/16/2026

Dawit Yifru, PhD, PG


Dawit Yifru is Principal Hydrogeologist based in Georgia with more than 17 years of experience focusing on environmental investigation and remediation strategies for contaminated private, public, and industrial facilities.

Dawit Yifru, a Principal Hydrogeologist at Geosyntec

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07/22/2024

Jeremy Yeglin, PE


Jeremy is a Senior Principal Engineer based in Texas with more than 15 years of consulting experience focused on providing multi-disciplinary engineering and environmental solutions to his clients in the oil & gas, solid waste, mining, and manufacturing sectors.

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07/30/2021

Jessica Yeager, PE, LSP


Jessica Yeager is a Senior Principal Environmental Engineer based in Kansas with more than 14 years of experience focused on strategic, risk-based closures and complex remedial design for legacy and brownfield redevelopment sites. Jessica is also a Licensed Site Professional (LSP) in Massachusetts, allowing her to render site clean-up decisions under the Massachusetts Contingency Plan (MCP).

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06/14/2021

Kenneth Yass, PE, CHMM


Ken Yass is a Senior Principal Environmental Engineer based in Wisconsin with more than 30 years of experience focused on providing environmental compliance and due diligence services for industrial clients in most US states and the American Samoa.

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09/09/2019

Evi Yapit


Evi Yapit is a Principal Consultant based in Australia with more than 16 years of experience focused on delivering pragmatic and innovative environmental solutions encompassing site assessment and remediation, advanced water treatment, hazardous waste management, and resource recovery on behalf of clients in the private and public sectors.

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04/16/2026

Nicholas Yafrate, PhD, PE


Nick Yafrate is a Senior Principal Engineer based in Massachusetts with more than 11 years of experience in geotechnical engineering design, geotechnical instrumentation, and solid-waste facility services.

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12/05/2019

Jim Wragg, FGS


Jim Wragg is a Senior Principal Hydrogeologist based in the United Kingdom with more than 30 years of experience focused on the detailed investigation, assessment and remediation of contaminated soil and groundwater, working primarily with site owners across a wide spectrum of industrial sectors.

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10/13/2013

Keith Woodburne, PG, LG, RG, RPG


Keith Woodburne is a Principal Geologist based in Washington with more than 26 years of experience focused on environmental due diligence, contaminated site characterization, remediation, and regulatory closures.

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04/16/2026

Scott Wolfskill, GISP


Scott Wolfskill is a Senior Geographic Information Systems (GIS) Analyst and Manager based in California with more than 20 years of experience focused on managing and visualizing spatial data related to environmental remediation, transportation, seismic assessment, geohazards, and utilities.

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Andrea Wojtyniak, QPRA


Andrea Wojtyniak is a Senior Scientist and Risk Assessor based in Ontario with more than 15 years of experience focused on human health and ecological risk assessments, environmental compliance reporting, due diligence, and product safety and compliance.

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