Litigation and Expert Witness Support

Expert Witness Training



Our Team


The Pennsylvania State University
B.S. in Civil Engineering
Minor in Environmental Engineering

Oregon Graduate Institute of Science and Technology
M.S. in Environmental Science and Engineering


Wendy Pearson

Wendy Pearson is the founder of Pearson Research Group. She has over 15 years of experience providing litigation support and expert witness support on over 50 major cases involving contaminants in the environment. She worked closely with law firms and experts on the PG&E hex chrome cases in California, the Monsanto PCB cases in Anniston, Alabama, and NJDEP’s lawsuit involving dioxin contamination in the Passaic River.

Ms. Pearson’s expertise encompasses bridging the gap between science, engineering and the law. Her advice and knowledge on environmental issues is relied on throughout all phases of the litigation process. She assists clients in locating qualified experts, preparing document production requests, preparing for depositions of both fact witnesses and experts, preparing Daubert motions and responses, providing peer-review of expert reports, and preparing for direct examination and cross examination of experts at trial. Ms. Pearson also fully supports expert witnesses throughout the litigation process: estimating budgets, assisting with expert reports, deposition preparation and trial preparation, and even trial demonstratives.

Prior to forming Pearson Research Group, Ms. Pearson developed her expertise at Matson & Associates (M&A), an environmental consulting firm specializing in environmental forensics and litigation support. Working closely with Dr. Jack Matson, she successfully grew the company, involving the firm in more complex and high-profile litigation. Ms. Pearson refined her ability to evaluate operations and practices at industrial sites for compliance with industry and regulatory standards concerning the use, handling, storage, treatment and disposal of chemicals and waste streams. With her academic training, management capabilities, and passion for science, engineering and the law, Ms. Pearson quickly took on a leadership role as Project Manager, acting as the primary point of contact with clients and overseeing research efforts of staff, and ultimately becoming President of the company, directing the vision and mission of the firm.

Affiliate Experts

Pearson Research Group is complemented by the expertise of highly qualified experts in the fields of environmental chemistry, and chemical and environmental engineering to assist on complex environmental litigation matters.

Jack V. Matson, Ph.D., PE

Jack Matson is an expert in evaluating chemical releases and industry standard of care at manufacturing facilities, and commercial and industrial sites. He has been a testifying expert in these areas for over 30 years on cases involving the release of contaminants into the environment throughout the United States. Dr. Matson has vast expertise with environmental contaminants including PCBs, chlorinated solvents, dioxin, heavy metals, benzene, PAHs, pesticides, perchlorate and constituents associated with petroleum. He has prepared expert opinions in over 100 cases and has testified at trial over 20 times.

Dr. Matson has more than 40 years of experience in the field of Environmental Engineering. His experience ranges from working as a chemical/environmental engineer for chemical companies in 1960s, a consulting engineer to a variety of chemical facilities on ways to reduce chemical discharges through treatment, reuse and recycle, to being Professor of Environmental Engineering. His academic background includes a B.S. and M.S. in Chemical Engineering from the University of Toledo and a Ph.D. in Environmental Engineering from Rice University.

Robert Parette, Ph.D., PE

Dr. Parette is an expert in source identification, environmental chemistry, industrial chemistry, water and wastewater treatment, and groundwater, soil and sediment remediation. Dr. Parette has over 10 years of experience with the removal of contaminants such as perchlorate, arsenic, MTBE, and contaminants from coal ash and mining wastes from drinking water and groundwater. He has assessed the feasibility of remediating contaminated sites and provided remedy selection and conceptual design for site remediation.

Dr. Parette’s unique expertise in understanding the chemistry and operations of industrial processes allows him to reconstruct the composition, quantity, and timing of historical chemical releases, as well as to determine the origin(s) of chemicals found in the environment. He has applied environmental forensics techniques (including chemical fingerprinting) in a number of cases concerning cost allocation disputes, natural resource damage, insurance coverage, property damage and personal injury involving PCBs, arsenic, dioxin, MTBE, and heavy metals. He has a B.S. in Chemical Engineering from Worcester Polytechnic Institute, and an M.S. and Ph.D. from The Pennsylvania State University in Environmental Engineering. He is also a Professional Engineer registered in Pennsylvania.