and has directed the development of several commercial software packages used in environmental and ecologic risk analysis.

DALE D. HANCOCK, DVM, MS, PhD, is a professor and epidemiologist in the Field Disease Investigation Unit of the Department of Veterinary Clinical Sciences at Washington State University. Dr. Hancock is a veterinarian who has conducted extensive research into the prevalence, risk factors, and epidemiology of E. coli O157:H7 in cattle. As a professor at Washington State University, he teaches courses in quantitative epidemiology and public health. Dr. Hancock has published extensively, with articles appearing in many journals, including Epidemiology and Infection, International Journal of Food Microbiology, and Journal of Food Protection. He has written chapters in two recent books by the American Society for Microbiology: Emerging Infectious Diseases of Animals and Escherichia coli O157:H7 and Other Shiga Toxin Producing E. coli Strains. Dr. Hancock is a frequent invited speaker at national and international food-safety and veterinary conferences.

MYRON M. LEVINE, MD, DTPH, is the director of the internationally recognized Center for Vaccine Development at the University of Maryland School of Medicine and holds faculty appointments as professor in four departments: Medicine, Pediatrics, Epidemiology, and Microbiology and Immunology. In two of those departments, Dr. Levine is a division head: the Division of Geographic Medicine in the Department of Medicine and the Division of Infectious Diseases and Tropical Pediatrics in the Department of Pediatrics. He has been elected to many professional societies, including the Institute of Medicine, the American Epidemiological Society, and the Association for American Physicians. He has served on many international committees and is a member of the Working Group of the Global Alliance for Vaccines and Immunization. Dr. Levine has published over 413 journal articles and serves on the editorial board of the American Journal of Epidemiology, Public Health Reviews, and Vaccine.

GREG PAOLI, MASc, is the president of Decisionalysis Risk Consultants, Inc, a firm specializing in assessment, communication, and management of health risk, primarily in the field of food safety. He has served on several international panels, most recently participating in the Expert Consultations as part of the Joint Food and Agriculture Organization and World Health Organization (FAO/WHO) activities on microbial risk assessment. He serves as chair of the Food and Water Risk Specialty Group of the Society for Risk Analysis. Mr. Paoli was part of a Canadian research team that developed a quantitative risk assessment of E. coli O157:H7 in ground beef. He has also published extensively in risk assessment. He

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