Brandon C. Welsh is Professor in the School of Criminology and Criminal Justice at Northeastern University and Senior Research Fellow at the Netherlands Institute for the Study of Crime and Law Enforcement.David P. Farrington is Director of Research, Emeritus Professor of Psychological Criminology, and Leverhulme Trust Emeritus Fellow at the Institute of Criminology, Cambridge University. He is a former president of the American Society of Criminology, the British Society of Criminology, and the European Association of Psychology and Law. Less