William R. Miller, PhD, is Emeritus Distinguished Professor of Psychology and Psychiatry at the University of New Mexico. He has published 40 books, including Motivational Interviewing: Helping People Change, and his many scientific publications reflect his interests in the psychology of change, the treatment of addictions, and the interface of psychology and spirituality. The Institute for Scientific Information lists him as one of the world's most cited scientists.

• Author's website
• All titles by William R. Miller

Janet C'de Baca, PhD, received her doctorate in clinical psychology from the University of New Mexico. She is currently a research scientist with the Behavioral Health Research Center of the Southwest, in Albuquerque. Her professional interests include cross-cultural psychology and the prevention and treatment of addictive behaviors.