David G. Hoel, PhD, Distinguished University Professor, Department of Biometry and Epidemiology at the Medical University of South Carolina, Charleston. Dr. Hoel earned his PhD from the University of North Carolina at Chapel Hill. His research specialties include environmental causes of cancer, especially ionizing radiation; risk-assessment models; statistical inference, particularly sequential procedures; statistical and mathematical applications in biology and medicine; epidemiology; and radiation health effects. Dr. Hoel was formerly an associate director of the Radiation Effects Research Foundation, Hiroshima, Japan. He is a member of the Institute of Medicine, and has served on numerous national committees, including committees of the National Research Council.

David G. Kocher, PhD, senior scientist at SENES Oak Ridge, Inc., Center for Risk Analysis, Oak Ridge, Tennessee. He earned his PhD in physics from the University of Wisconsin-Madison in 1970. He joined the research staff at Oak Ridge National Laboratory (ORNL) in 1971, where he worked as an environmental health physicist from 1976 to 2000. His principal research activities at ORNL involved the development and implementation of models and databases for estimating radiation doses to the public from exposure to radionuclides in the environment; the results of this work have been widely used in assessing radiological effects of releases from operating nuclear facilities and from disposal of radioactive waste. An important focus of his work has involved evaluations of environmental dose-assessment models for regulatory and decision-making purposes. He served as a member of several technical advisory groups for the Department of Energy, the Science Advisory Board of the Environmental Protection Agency, the Nuclear Regulatory Commission, and the International Atomic Energy Agency in environmental radiological assessment and management of radioactive and hazardous chemical wastes, and he served on the National Research Council’s Committee on Evaluation of EPA Guidelines for Exposure to Naturally Occurring Radioactive Materials. In 1999, he was elected to membership in the National Council on Radiation Protection and Measurements (NCRP), and he has served on NCRP scientific committees on risk-based classification of radioactive and hazardous chemical wastes, performance assessment for disposal of low-level radioactive waste, and risk management analysis for decommissioned sites. He has lectured widely in external and internal dosimetry, environmental radiological assessments, radioactive-waste management, and laws and regulations addressing public exposures to radionuclides and hazardous chemicals in the environment. He joined SENES Oak Ridge, Inc., in December 2000. His activities at SENES have included development of the radiation effectiveness factors (REFs) used in the compensation program for sick workers at Department of Energy facilities and participation in the dose reconstruction for historical releases at Idaho National Engineering Laboratory.

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