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Russell E. Keenan, Ph.D.

Russell E. Keenan, Ph.D.

Dr. Russ Keenan is a toxicologist with 25 years of experience specializing in chemical risk assessment focused on the potential human health and ecological risk of organic and inorganic chemicals and on time-dependent probabilistic risk assessment methods. He directs a team of scientists in evaluating risks associated with chemical exposures at a number of sites involving multiple exposure pathways.

John Samuelian, Ph.D.

John Samuelian, Ph.D.

Dr. John Samuelian has more than 30 years of experience in environmental consulting, analytical chemistry, database development, human and ecological risk assessment, quality assurance, site investigation design, and remedial alternatives evaluation. His projects have included PCB and dioxin sites, municipal and industrial landfills, arsenals, pulp and paper mill sites, contaminated sediment sites, radiological sites, and solvent waste sites.

R. Dreas Nielsen

R. Dreas Nielsen

Mr. Dreas Nielsen specializes in quantitative analysis of environmental data. His scientific expertise is principally in the areas of sediment contamination, chemical bioaccumulation, biological effects of contaminants, and chemical transport and fate. His approach to scientific topics stresses analytical and quantitative methods, with an emphasis on computer applications.

Peter W. Zimmermann, P.G.

Peter W. Zimmermann, P.G.

Mr. Peter Zimmermann has more than 25 years of experience in the fields of hazardous waste management, environmental due diligence, hydrogeology, constituent fate and transport, conceptual remedy design, and remedial construction. He has applied this experience on site remediation assignments, real estate due diligence assessments, site restoration projects, and expert witness and litigation support work.