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John D. Schell, Ph.D.

Principal Scientist

Toxicology & Mechanistic Biology

(832) 325-5703 tel
(281) 879-0687 fax


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Professional Profile

Dr. Schell has more than 20 years of environmental assessment experience, focusing on human health and ecological impacts of PCBs, dioxins, volatile organic, chlorinated pesticides, and metals. He is a former member of the faculty at the University of Florida, and has held adjunct teaching positions at the University of South Florida and the University of Florida. He has experience performing human health and ecological risk assessments under state and federal programs such as Superfund, RCRA, and state Risk-Based Corrective Action (RBCA) programs. His broad experience includes assessing the toxicity of PCBs, dioxins, VOCs, pesticides, aromatic hydrocarbons, and metals, investigating their mode of action, and their impact on human health and the environment. His activities include work on some of the largest CECLA sites in the U.S., and he has worked on projects in 27 states across the country. He has also particpated in several project for the oil and gas sector including air monitoring/modeling at an active facing site and developing a hazard ranking system for hydraulic fracturing fluids, and conveyed these finding in scientific publications and public meetings.

Prior to joining Exponent, Dr. Schell was a staff toxicologist at the St. Johns River Water Management District where he worked with scientists from the Florida Department of Health in developing fish advisory, and has served as a consultant to the District for their Lake Apopka and Everglades restoration programs. Dr. Schell has served on advisory bodies on chemical risk assessment issues in Florida and Michigan, has presented to international regulatory and scientific bodies and numerous public hearings, and has provided Congressional briefings in Washington D.C. Dr. Schell is a former member of the USEPA Pesticide Program Dialogue Committee, and he has been qualified as an expert in toxicology in both federal and state courts.

  • Ph.D., Toxicology, Rutgers University, 1987
  • B.S., Zoology, University of South Florida, 1977