James C. Oleson is Associate Professor of Criminology at the University of Auckland. He has a B.A. from St. Mary's College of California, an M.Phil. and a Ph.D. from Cambridge University, and a J.D. from UC Berkeley. After being selected as a 2004-2005 U.S. Supreme Court Fellow, he led the Criminal Law Policy Staff of the United States Courts until 2010. He is interested in psychological criminology, theory, risk assessment, sentencing, and penology.

Barbara J. Costello (Ph.D., University of Arizona) is Professor of Sociology at the University of Rhode Island. Her research has focused on testing and extending control theories of crime and delinquency. Her recent research focuses on peer influence both toward and away from deviant behavior, with an emphasis on the mechanisms by which peers influence each other's behavior.