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
Scott Becker, Ph.D.
Senior Managing Ecotoxicologist
Dr. Scott Becker is an ecotoxicologist specializing in sediment quality evaluations, sediment toxicity testing, benthic ecology, fish ecology, and fish pathology. He has directed a wide variety of projects related to the ecological effects of toxic chemicals in freshwater, estuarine, and marine sediments throughout the United States. Dr. Becker has conducted numerous ecological risk assessments (ERAs) and natural resource damage assessments (NRDAs) to evaluate potential injuries to benthic macroinvertebrates, fishes, and aquatic-dependent wildlife at a variety of Superfund, RCRA, and other kinds of sediment sites. He is a co-developer of the apparent effects threshold (AET) approach for establishing sediment quality guidelines (SQGs), and he used that approach to help develop the sediment management standards for Washington State. Dr. Becker has used the most recent advances in sediment science to evaluate chemical toxicity at various sediment sites, including development of site-specific SQGs, use of the SQG quotient approach, use of toxicity identification evaluations (TIEs), and evaluation of metals bioavailability using acid volatile sulfide (AVS), simultaneously extracted metals (SEM), chemical speciation and electron microprobe analysis.
Dr. Becker has also evaluated the effects of sewage disposal, pulp mill effluents, and dredge-spoil dumping on sedimentary environments. He has authored a variety of journal publications and technical reports, and has chaired regional workshops to develop standardized environmental sampling protocols for Puget Sound. Dr. Becker has given technical presentations to numerous state and federal agencies, and he has participated in negotiations of remedial actions with multiple stakeholder groups. He has helped design remediation plans that included dredging, containment capping, thin layer placement, and monitored natural recovery (MNR). He has also helped design remedial plans that optimize habitat, including enhancements of macrophyte beds, soft-bottom benthic habitat, fish spawning and nursery areas, wetlands, and shoreline stabilization.
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