Dr. Joan Petersilia has spent more than 25 years studying the performance of criminal justice agencies. Before joining Stanford Law School, Dr. Petersilia was a professor of criminology, law and society at the University of California, Irvine and Director of UCI's Center for Evidence-Based Corrections. She also previously served as a special advisor to Gov. Arnold Schwarzenegger, helping to reorganize juvenile and adult corrections and working with the California Legislature to implement prison and parole reform. Dr. Petersilia is a former director of the Criminal Justice Program at RAND Corporation; former president of the American Society of Criminology; and co-director of the National Research Council’s study on Community Supervision and Criminal Desistance.