John R. Lutzker, PhD, is Chief of the Prevention Development and Evaluation Branch of the Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention. Formerly, he was the Florence and Louis Ross Distinguished Professor and Chair of the Department of Psychology and Director of Graduate Training in Behavioral Psychology at the University of Judaism. The author or editor of three previous books, Dr. Lutzker serves on the editorial boards of a number of professional journals. Kathryn M. Bigelow, MA, is a doctoral candidate in