Dr. Hopfer is Professor of psychiatry in the Division of Substance Dependence at the University of Colorado School of Medicine. Before coming to CeDAR he served as the Director of Adult Psychiatric Services at the Addiction Research and Treatment Services for 15 years. Dr. Hopfer is a distinguished Fellow of the American Psychiatric Association, member of the College on Problems of Drug Dependence, and past president of the Colorado Child and Adolescent Psychiatric Society. He has authored over 95 scientific publications on substance dependence and has been the principal investigator on multiple studies funded by the National Institute on Drug Abuse. He is currently leading a large study focused on understanding the impact of marijuana legalization on substance use and mental health outcomes.