Walter LingNeuropsychiatrist Walter Ling, MD, is a pioneer in research and clinical practice for science-based addiction treatment. Dr. Ling has served as a consultant on narcotic affairs to the US Department of State and the World Health Organization. He is Prfessor Emeritus of Psychiatry and the founding director of the Integrated Substance Abuse Programs (ISAP) at the University of California, Los Angeles. Read More Read Less