Tom Christoffel, J.D., is Professor in the School of Public Health, University of Illinois at Chicago. He is the author of four books and over 50 articles on health law and injury. Professor Christoffel recently served as chair of the Injury Control and Emergency Health Services section of the American Public Health Association. Stephen Teret, J.D., M.P.H., is Director of the John Hopkins Injury Prevention Center. As a lawyer trained in public health, he has focused his work on the epidemiology and policy of injury prevention, with emphasis on strategies that involve the law.