Mr. Gregory P. Brorby is the Exposure Assessment, Environmental Sciences, and Engineering Practice Director for the Center for 21st Century Toxicology. He is a board-certified toxicologist with more than 25 years of experience in the fields of human health risk assessment, exposure simulation and dose reconstruction, and toxicology. Mr. Brorby has evaluated potential human health risks according to risk assessment methods prescribed in CERCLA and other guidance issued by state or federal agencies. These evaluations have involved a wide variety of chemicals (asbestos, metals, VOCs, SVOCs, pesticides/PCBs, dioxins and furans, petroleum hydrocarbons, and radionuclides); environmental media (air, soil, groundwater, surface water, plant material); and exposure scenarios (residential, commercial/industrial, recreational). Mr. Brorby focuses on integrating risk assessment into an overall risk management approach to site investigation and remediation. This approach uses site conceptual models to design risk-based sampling and analysis plans based on the current or proposed future site use; the scope of the investigation is thus streamlined to collect only data needed to support a risk-based decision.
Mr. Brorby has directed or participated in studies to estimate exposure to chemicals from use of consumer products (e.g., PVC-coated electrical cables, children’s toys, jewelry, and food and beverage containers), particularly with regard to potential exposure via incidental hand-to-mouth contact, to assess compliance with CPSC, FDA, and California Proposition 65 requirements. Mr. Brorby has also directed or participated in studies to reconstruct historical exposures in occupational settings (e.g., vehicle mechanic exposure to asbestos in friction materials).
Mr. Brorby also specializes in conducting independent review of risk assessment–related work performed by others. He played an instrumental role in the dose reconstruction projects at Rocky Flats and the Oak Ridge Reservation, the Environmental Restoration Project at the Los Alamos National Laboratory, the RCRA/ CERCLA process at the Pantex Plant, and cleanup and restoration of former Naval Air Station Treasure Island. In this capacity, he worked closely with advisory panels and steering committees to develop risk assessment strategies and communicate complicated technical information to a non-technical audience.