LAWRENCE W. SHERMAN has designed and directed over 25 randomized field experiments in policing, prosecution, probation and private security. The founder of the Academy of Experimental Criminology and Chair of the Division of Experimental Criminology of the American Society of Criminology, he has received the Beccaria Medal from the Society of Criminology of German-Speaking Nations, the Sutherland Prize of the American Society of Criminology, the McCord Prize of the Academy of Experimental Criminology, and other awards for distinguished scholarship from the American Sociological Association, the American Academy of Political and Social Science, and the Academy of Criminal Justice Sciences. He is the most highly-cited police scholar in English-language research journals, and is Director of the Police Executive Programme at Cambridge University, where he also directs the Jerry Lee Centre for Experimental Criminology.