Wesley G. Jennings, Ph.D. is Associate Professor, Associate Chair, and Undergraduate Director in the Department of Criminology, has a Courtesy Appointment in the Department of Mental Health Law and Policy, and is a Faculty Affiliate of the Florida Mental Health Institute in the College of Behavioral and Community Sciences at the University of South Florida.  In addition, he also has a Courtesy Appointment in the Department of Health Outcomes & Policy and is a Faculty Affiliate of the Institute for Child Health Policy in the College of Medicine at the University of Florida.  He received his doctorate degree in criminology from the University of Florida.  Rolf Loeber, Ph.D., is Distinguished University Professor of Psychiatry, and Professor of Psychology, and Epidemiology at the University of Pittsburgh, Pittsburgh, Pennsylvania. He is Director of the Life History Program and is the initiator of two large longitudinal studies, the Pittsburgh Youth Study, and the Pittsburgh Girls Study. Dustin Pardini, Ph.D., is an Associate Professor in the School of Criminology and Criminal Justice at Arizona State University. He originally began working with the Drs. Rolf Loeber and Magda Stouthamer-Loeber as a post-doctoral fellow on the Pittsburgh Youth Study the University of Pittsburgh in 2003, becoming Co-Director of the study in 2011.  He has co-managed the last three longitudinal follow-ups of the PYS participants and led efforts to update the official criminal record database to include offenses that occurred from 2000-2011.  Alex R. Piquero, Ph.D., is the Ashbel Smith Professor of Criminology and Associate Dean for Graduate Programs in the School of Economic, Political, and Policy Sciences at the University of Texas at Dallas and Adjunct Professor with the Key Centre for Ethics, Law, Justice, and Governance at Griffith University. From 2008 until 2013 he was Co-Editor of the Journal of Quantitative Criminology.  David P. Farrington is Emeritus Professor of Psychological Criminology in the Institute of Criminology, Cambridge University. He received the Stockholm Prize in Criminology in 2013. He is Chair of the American Society of Criminology Division of Developmental and Life-Course Criminology. His major research interest is in developmental criminology, and he is Director of the Cambridge Study in Delinquent Development, a prospective longitudinal survey of over 400 London males from age 8 to age 56.