Select Page

Judi L. Durda

Judi L. Durda

Ms. Judi Durda is a toxicologist and ecologist with more than 30 years of experience in the health and environmental science fields, working on behalf of both government and private clients. She specializes in using science and science-based strategies to resolve issues related to the manufacture, use, or disposal of chemicals, consumer products, pharmaceuticals, and hazardous and nonhazardous wastes.

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.

William Cutler, Ph.D., P.G.

William Cutler, Ph.D., P.G.

Dr. William Cutler is a professional geologist with more than 30 years of experience in geosciences primarily focused on environmental site assessment and remediation. He is well versed in managing all aspects of environmental projects, including strategy development, study design, senior management and agency communications, consulting and contracting services, field implementation, community relations, government affairs, and financial assessment.

Steven O. Helgen

Steven O. Helgen

Mr. Steve Helgen is a consultant specializing in geochemistry, hydrogeology, and environmental forensics. He has more than 20 years of experience in contaminant fate and transport, geochemical fingerprinting, and apportionment in complex, multiparty environmental disputes involving sediments, groundwater, and industrial facilities. Mr. Helgen has provided expert testimony in both state and federal courts.

Damian V. Preziosi

Damian V. Preziosi

Mr. Damian V. Preziosi is an environmental scientist with more than 20 years of experience evaluating potential ecological and human health risks associated with exposures to physical, chemical, and biological hazards. He supports clients in North America, South America, Europe, and Asia for work in the energy, chemical, and mining sectors.

David Livermore, R.G., L.H.G., CWRE

David Livermore, R.G., L.H.G., CWRE

Mr. David Livermore is a principal hydrogeologist and geochemist with 30 years of experience in solving complex earth science problems centered on the interaction of hydrogeologic, geologic, and atmospheric systems. He is a registered professional geologist in six states and a licensed hydrogeologist in Washington.

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.

Patrick O. Gwinn

Patrick O. Gwinn

Mr. Patrick Gwinn has more than 25 years of experience applying his expertise in human health and ecological risk assessment, water quality, fate and transport dispersion modeling, product stewardship, air toxics sampling, and hazardous waste management. He has been instrumental in developing and leading projects aimed at establishing site-specific ambient water quality criteria and pollutant discharge limits.

Marcia Greenblatt, Ph.D., P.E.

Marcia Greenblatt, Ph.D., P.E.

Dr. Marcia Greenblatt is a water resources engineer with nearly 20 years of specialized experience in hydrodynamic, water quality, and sediment investigations. She has extensive involvement in CERCLA remedial investigations and feasibility studies at large sediment sites. Her responsibilities have included design of sediment, water column, and bathymetric data collection programs and field sampling plans.

Laura Jones

Laura Jones

Ms. Laura Jones is an analytical chemist with more than 25 years of experience in data integrity evaluations, custom data/document management systems, environmental investigations, and QA/QC data review and validation. She manages large, multimedia environmental investigations, prepares sampling and analysis plans and QA project plans, interprets data, and develops QA programs for sites within various state and federal regulatory programs.

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.

Avram Frankel, P.E.

Avram Frankel, P.E.

Mr. Avram Frankel is a program manager with nearly 30 years of experience working on a wide range of commercial/industrial, municipal, state, and federal sites regulated under a variety of regulatory programs. Licensed in four states, he provides clients with strategic management and technical analysis of due diligence, redevelopment, technology evaluation, remediation, and litigation matters.

Barry L. Kellems, P.E.

Barry L. Kellems, P.E.

Mr. Barry Kellems is a principal engineer and project manager with more than 30 years of consulting experience, focusing on environmental remediation of contaminated sediments, groundwater, and soils. He has prepared feasibility studies, developed cleanup action plans, and served as project manager/engineer for a broad range of in situ and ex situ treatment projects.

Bridgette R. DeShields

Bridgette R. DeShields

Ms. Bridgette DeShields has 27 years of experience and is a specialist in regulatory strategy, site investigation, site remediation, sediment and water quality management, and environmental toxicology. She has managed programs ranging from large site investigations to screening and quantitative ecological and human health risk assessments.

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.

William Locke, P.E.

William Locke, P.E.

Mr. William Locke is a hydrologist and registered civil engineer. He has more than 25 years of experience in investigation of complex environmental systems, fate and transport assessments, remedy analysis and selection, and regulatory affairs. Mr. Locke advises a broad range of clients on scientific and engineering issues, regulatory strategy, and management of environmental assets and liabilities.