Christopher D. Webster, PhD, FRSC, C.Psych. is a Professor of Psychiatry and Criminology at the University of Toronto and Professor Emeritus of Psychology at Simon Fraser University in British Columbia. From 1993 to 1997 he was Professor and Chair of the Department of Psychology at Simon Fraser. Most of his earlier professional career was spent at the Clarke Institute of Psychiatry in Toronto where he held a variety of research, teaching and administrative positions. He is mainly known for his work on the prediction of violence in mentally and personality disordered patients and prisoners. In addition to several books and numerous articles, he has, in recent years, published with colleagues in Vancouver and Toronto a number of practical manuals for use by mental health and correctional practitioners that focus on the broad-based screening of violence (HCR-20), sex offenders (SVR-20), and aggressive boys under 12 years old (EARL-20B). The approach underlying these manuals has been to draw clinicians and researchers together in order to establish guides that are scientifically defensible and based on sound professional practice. Since 1997 he has developed an international research and training consulting practice in the area of risk assessment and management.