industrial hygiene, and risk assessment. Dr. Bishop is a member of the NRC Committee on Toxicology and the Subcommittee on Acute Exposure Guideline Levels. He received his M.S. in engineering from the University of California, Los Angeles, and his Ph.D. in environmental health sciences from the University of California, Berkeley.

KENNETH T. BOGEN is a senior environmental scientist at Lawrence Livermore National Laboratory’s Environmental Science Division at the University of California, Livermore. His research involves cancer-risk assessment methods, regulatory toxicology, biodosimetric and pharmacokinetic modeling, and quantitative uncertainty analysis. He has been a principal and co-investigator on related research projects funded by the U.S. Department of Energy, EPA, and others. He is an appointed member of the University of California Davis Cancer Center, and past president and current councilor of the Northern California Chapter of the Society for Risk Analysis. He served in 2000-2001 as chairman of the U.S. Consumer Product Safety Commission’s Chronic Hazard Advisory Panel (CHAP) on Diisononyl Phthalate (DINP). Dr. Bogen served on the NRC Committee on Science and Judgment in Risk Assessment. He received his Dr.P.H. at the University of California, Berkeley.

BARBARA G. CALLAHAN is a senior toxicologist at University Research Engineers and Associates, and also holds an appointment as adjunct associate professor in environmental health sciences at the University of Massachusetts, Amherst. Her research interests include exposure and risk assessment evaluations of sites contaminated with pesticides, PCBs, heavy metals, and polycyclic aromatic hydrocarbons. She is a member of several national committees that study the effects of acute exposure to toxicants on human health after accidental release under emergency conditions and is senior editor for Human and Ecological Risk Assessment. Dr. Callahan is a recipient of the U.S. Army Environmental Hygiene Agency Commander’s Medallion. She is former member of the NRC’s Standing Committee on Program and Technical Review of the U.S. Army Chemical and Biological Defense Command. Dr. Callahan received her M.S. in biology from Rivier College and her Ph.D. in toxicology from Northeastern University. She is also a diplomate of the American Board of Toxicology.

JUDITH GRAHAM is a senior scientist with the American Chemistry Council (ACC). She serves as senior director of the council’s long-range research initiative (LRI) team that sponsors research that advances the science of risk



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