Arnold P. Goldstein, Ph.D., is Professor of Special Education at Syracuse University, Director of the New York State Task Force on Juvenile Gangs, a member of the American Psychological Association Commission on Youth Violence, and a member of the Council of Representatives, International Society for Research on Aggression. He has developed three increasingly competitive approaches to prosocial skills training, skillstreaming, aggression replacement training, and the Prepare Curriculum. Reflecting his role as Director of the Syracuse University Center for Research on Aggression, much of his research and teaching have centered on helping youngsters replace antisocial, aggressive behaviors with constructive, alternative means of seeking life satisfaction and effectiveness.