Franklin E. Zimring is William G. Simon Professor of Law and Director of the Earl Warren Legal Institute at the University of California at Berkeley. He is the author of The Changing Legal World of Adolesence (1982) and co-author of many books on law and legal institutions, including Incapacitation: Penal Confinement and the Restraint of Crime (1995) and Crime Is Not the Problem: Lethal Violence in America (with Gordon Hawkins, Oxford, 1997).