George De Leon, PhD, is an internationally recognized expert in the treatment of substance abuse and is acknowledged as the leading authority on research in therapeutic communities. He is the director of the Center for Therapeutic Community Research (CTCR) at National Development and Research Institutes, Inc. (NDRI), funded by the National Institute on Drug Abuse(NIDA), and Clinical Professor of Psychiatry at New York University. In addition to numerous research publications, Dr. De Leon has made notable contributions in the areas of clinical practice and professional education. He provides tr...