Jonathan Shepherd is Professor of Oral and Maxillofacial Surgery at the University of Cardiff, UK and Director of the Violence and Society Research Group there. His major clinical and research interest is trauma, particularly the surgery and epidemiology of violence. Among other research papers, his evaluations of urban CCTV and his randomised controlled trial of toughened glass have been published in Injury Prevention. He is the recipient of the Leibinger Prize of the International Association for Dental Research for his randomised experiments in alcohol misuse, and was the recipient of the 2003 Sellin and Glueck Award of the American Society of Criminology “for international contributions to criminology”. He is qualified in public health and emergency medicine and is a Fellow of the Academy of Medical Sciences.