Daniel O’Connell, PhD is a Senior Scientist at the Center for Drug and Health Studies and Assistant Professor in the Department of Sociology & Criminal Justice at the University of Delaware. He specializes in applications of criminological theory, with a focus on desistance from criminal and addiction careers. His main research areas are focused on drug addiction and violence, correctional practice, prisoner reentry, drug treatment and corrections, with a special focus on research methodologies and statistical applications in criminal justice.