Joan Ellen Zweben, PhD, is founder and Executive Director of the 14th Street Clinic (1979-2007), and East Bay Community Recovery Project (1989- present), organizations providing comprehensive treatment in Oakland, California. She is committed to providing flexible, evidence-based treatment to challenging and underserved populations. Dr. Zweben is a clinical psychologist with over thirty-five years' experience in treating addiction, and training treatment practitioners. She is the author of 3 books, over 55 articles or book chapters and editor of 15 monographs on treating addiction. She is a Clinical Professor of Psychiatry at the University of California, San Francisco.