William R. Miller is Professor of Psychology and Psychiatry at the University of New Mexico, and Director of the Research Division of UNM's Center on Alcoholism, Substance Abuse, and Addictions. He has published 17 books and more than 100 articles and chapters, focusing primarily on the treatment of alcohol problems and addictive behaviors. He has developed and evaluated a variety of innovative clinical strategies and, along with G. Alan Marlatt, designed a comprehensive set of structured clinical interviews for pre-treatment and follow-up assessment of alcohol problems. He has held numerous research grants, founded a private practice, served as a consultant to many organizations, and currently holds a 5-year Senior Career Research Scientist Award from the National Institute on Alcohol Abuse and Alcoholism. Stephen Rollnick has worked in the addictions field over the past 16 years as a clinician, supervisor, trainer, and manager. His research interests cover the process and outcome of treatment and training. The author of a variety of papers and articles on these and other topics, he currently works as a Principal Clinical Psychologist in a general practice setting and is completing collaborative studies with the World Health Organization and the National Drug and Alcohol Research Centre in Sydney, Australia.