began his career as assistant professor in the Department of Pathology at Temple University School of Medicine in 1971. He is board certified in pathology and toxicology. Dr. Williams’ research focuses on mechanisms of chemical carcinogenesis and risk assessment. He has served on numerous working groups and committees of the NRC, EPA, International Agency for Research on Cancer, and World Health Organization. He has received many honors, including the Arnold J. Lehman and Enhancement of Animal Welfare Awards from the Society of Toxicology, and was elected fellow of the Royal College of Pathologists (U.K.).

Yiliang Zhu is a professor and director of the biostatistics Ph.D. program and the Center for Collaborative Research in the Department of Epidemiology and Biostatistics, College of Public Health, University of South Florida. Dr. Zhu earned a B.S. in computer science and applied mathematics from Shanghai University of Science and Technology (1982), an M.S. in statistics from Queen’s University (1987), and a Ph.D. in statistics from the University of Toronto (1992). Dr. Zhu’s research includes benchmark dose methods, dose response and PBPK modeling, and general methods in health risk assessment. Dr. Zhu has served on several EPA committees, including the Peer Review Committee on Neurobehavioral Dose-Response and Benchmark Method Guidance, Peer Review Committee on Benchmark Dose Software, Toxicological Review for 2-Methylnaphthalene, STAR Program Grant Review Committee for Global Change for Aquatic Ecosystems, and Peer Review Committee on Benchmark Doses Technical Guidance Document. Dr. Zhu is a member of the Advisory Committee on Organ Transplantation to the secretary of the U.S. Department of Health and Human Services.

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