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 -
Judi L. Durda
Vice President, Corporate Secretary, Principal Toxicologist -
David Livermore, R.G., L.H.G.
Principal Hydrogeologist -
William Locke, P.E.
Principal Hydrologist -
Randi Wexler
Principal, Regulatory Affairs -
Damian V. Preziosi
Principal Environmental Scientist -
James Lape
Principal Environmental Scientist, Human Health Risk Assessor -
Michael V. Ruby
Principal Scientist -
Steven O. Helgen
Principal Geochemist -
William Cutler, Ph.D., P.G.
Principal -
Reid M. Carscadden, P.E.
Principal Engineer -
Edward P. Conti, C.E.G., C.H.G., P.G.
Principal Geologist
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 -
Laura Jones
Senior Managing Scientist -
Todd Martin, P.E.
Senior Managing Engineer, Hydrogeochemist -
Jennifer Sampson
Senior Managing Ecologist -
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., P.E.
Senior Managing Hydrologist -
Ellen S. Ebert
Senior Managing Scientist -
Ramesh Venkatakrishnan, Ph.D., P.G.
Senior Science Advisor
Steven O. Helgen
Principal Geochemist
Mr. Steve Helgen is a consultant in geochemistry, hydrogeology, and environmental forensics. He has more than 15 years of experience in contaminant fate and transport, geochemical fingerprinting, and apportionment in complex, multiparty environmental disputes at industrial and mining sites. He has developed and published apportionment methods that have proven instrumental in settlement negotiations and at trial for a variety of industrial and mining clients. Mr. Helgen has successfully applied a number of geochemical forensic techniques used to identify sources and determine the timing and quantity of releases, and has provided expert testimony in both state and federal court. For the mining industry, Mr. Helgen has developed numerical models of reactive gas transport, sulfide oxidation, pit lake geochemistry, and metals behavior in stream sediments; assessed the fate and transport of acidic groundwater plumes; and designed and implemented materials characterization studies. His experience at industrial sites where organic compounds are present includes developing innovative remedial strategies, such as enhanced bioremediation of chlorinated solvents, assessing and modeling soil gas transport and indoor air vapor intrusion, isotopic studies, and natural resource damage assessment.
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