William R. Miller, PhD, is Emeritus Distinguished Professor of Psychology and Psychiatry at the University of New Mexico, where he joined the faculty in 1976. He served as Director of Clinical Training for UNM's American Psychological Association-approved doctoral program in clinical psychology and as Codirector of UNM s Center on Alcoholism, Substance Abuse, and Addictions. Dr. Miller s publications include 35 books and more than 400 articles and chapters. He introduced the concept of motivational interviewing in a 1983 article. The Institute for Scientific Information names him as one of the world's most cited scientists.