Robert D. Hoge, PhD, is Professor Emeritus of Psychology and Distinguished Research Professor at Carleton University in Ottawa, where he is involved in teaching and research in child and adolescent psychology, forensic psychology, and psychological assessment. He has served as a consultant to numerous government and private agencies in Canada, the United States, and other countries. Dr. Hoge has published numerous articles and books, and he is coauthor of the Youth Level of Service/Case Management Inventory, a widely used risk-need assessment tool.

Nancy G. Guerra, EdD, is Professor of Psychology at the University of California, Riverside. Her work focuses on the causes of childhood aggression and violence and on the development and evaluation of youth violence prevention and treatment programs. She has been involved in several national and international evaluation projects, and has served for the past 7 years as the principal investigator for the Southern California Academic Center of Excellence on Youth Violence Prevention. Dr. Guerra has published numerous articles, chapters, special issues, policy papers, and books.

Paul Boxer, PhD, is Assistant Professor in the Department of Psychology at Rutgers, The State University of New Jersey, and Adjunct Research Scientist in the Research Center for Group Dynamics at the University of Michigan. His research focuses on developmental psychopathology, particularly on the development of aggressive behavior in high-risk youth populations such as juvenile delinquents, psychiatric inpatients, and youth exposed to violence in communities and families. His studies emphasize the effects of ecological risk factors on social development. Dr. Boxer’s expertise also includes the design, implementation, and evaluation of violence prevention programming along with the assessment of risk for violent behavior.