Staff
Company Officers and Principals
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Lucinda Jacobs, Ph.D.
President, Principal Aquatic Scientist -
Betsy Day
Vice President, Principal Sediment Scientist -
Larry F. Marx
Vice President of Corporate Development -
Russell E. Keenan, Ph.D.
Vice President, Principal Toxicologist -
Marc Lorenzen, Ph.D.
Principal Business Advisor -
Judi L. Durda
Corporate Secretary, Principal Toxicologist -
David Livermore, R.G., L.H.G.
Principal Hydrogeologist -
William Locke, P.E.
Principal Hydrologist -
James Lape
Principal Environmental Scientist, Human Health Risk Assessor -
Michael V. Ruby
Principal Scientist -
Steven O. Helgen
Principal Geochemist -
William Cutler, P.G.
Principal -
Reid M. Carscadden, P.E.
Principal Engineer
Senior Managing Scientists and Engineers
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Robert Pastorok, Ph.D.
Senior Science Advisor, Ecologist -
Scott Becker, Ph.D.
Senior Managing Ecotoxicologist -
R. Dreas Nielsen
Senior Managing Marine Scientist, Quantitative Analyst -
Les Williams, Ph.D.
Senior Science Advisor, Aquatic Ecologist -
Todd Martin, P.E.
Senior Managing Engineer, Hydrogeochemist -
Jennifer Sampson
Senior Managing Ecologist -
Randi Wexler
Senior Managing Scientist, Regulatory Affairs -
Damian V. Preziosi
Senior Managing Environmental Scientist -
Andrew Nicholson, Ph.D.
Senior Managing Scientist -
Gene Revelas
Senior Managing Scientist -
Kenneth E. Kolm, Ph.D., P.G., P.Hg.
Senior Science Advisor -
Patrick O. Gwinn
Senior Managing Scientist -
John Samuelian, Ph.D.
Senior Managing Scientist -
Marcia Greenblatt, Ph.D.
Senior Managing Engineer
Priscilla Tomlinson
Managing Scientist, Human Health Risk Assessor
Ms. Priscilla Tomlinson is a toxicologist with more than 25 years of experience in the fields of risk assessment, risk management, risk communication, site investigation, and regulatory compliance with the Washington Model Toxics Control Act (MTCA). She has provided toxicological support and conducted risk assessments in support of private clients, city and county agencies, the U.S. Navy, and the Department of Energy for sites throughout the United States. She has extensive experience evaluating risks associated with, and developing cleanup levels for, sites contaminated with petroleum products. She assists in the design of site investigations, particularly in relation to risk assessment support and regulatory compliance. Ms. Tomlinson teaches classes on MTCA and has applied her regulatory expertise at numerous sites throughout Washington State. She also teaches classes on Washington State Department of Ecology’s spreadsheets for evaluating leaching of petroleum and other hazardous substances.
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