The authors would like to express their appreciation to colleagues on the Seattle Social Development Project and the Rochester Youth Development Study. We are very grateful to the dedicated staff who collected and processed the data and to the participants for their willingness to be interviewed repeatedly for this study. Without their assistance, the research could not have been conducted.

Sara R. Battin-Pearson, M.Ed., is a research analyst for the Seattle Social Development Project at the University of Washington. She is currently the primary analyst for the OJJDP-funded study titled The Dynamics of Gang Membership and Delinquency. Her expertise is in measurement, statistics, and research design. Her research interests include the etiology of adolescent delinquency, substance use, and mental health problems.

Terence P. Thornberry, Ph.D., is a professor and former dean at the School of Criminal Justice, University at Albany, State University of New York. He is the author of The Criminally Insane, From Boy to Man -- From Delinquency to Crime, and numerous articles and book chapters. His research interests focus on the longitudinal examination of the development of delinquency and crime and the construction of an interactional theory to explain these behaviors.

J. David Hawkins, Ph.D., is a professor of social work and the Director of the Social Development Research Group at the University of Washington. His research focuses on understanding and preventing child and adolescent health and behavior problems. He is also committed to translating research into effective practice and policy to improve adolescent health and development. Since 1981, he has been conducting the Seattle Social Development Project, a longitudinal prevention study based on his theoretical work.

Marvin D. Krohn, Ph.D., is a professor in the Department of Sociology, University at Albany, State University of New York. His research interests include the investigation of social psychological theories of adolescent substance abuse and delinquent behavior. He is currently involved in a panel study of inner-city youth designed to examine hypotheses derived from those perspectives.

Research for the Seattle Social Development Project and the Rochester Youth Development Study was supported by OJJDP under grants 95-JD-FX-0017 and 96-MU-FX-0014, respectively. The Seattle Social Development Project was also supported by grants from the National Institute on Drug Abuse and the Robert Wood Johnson Foundation.

Gang Membership, Delinquent Peers, and Delinquent Behavior Juvenile Justice Bulletin   ·  October 1998