William R. Miller, PhD, is Emeritus Distinguished Professor of Psychology and Psychiatry at the University of New Mexico. Fundamentally interested in the psychology of change, he is a cofounder of motivational interviewing and has focused particularly on developing and testing more effective treatments for people with alcohol and drug problems. Dr. Miller has published over 400 scientific articles and chapters and 50 books, including the groundbreaking work for professionals Motivational Interviewing, Third Edition, and the self-help resource Controlling Your Drinking, Second Edition. He is a recipient of the international Jellinek Memorial Award, two career achievement awards from the American Psychological Association, and an Innovators in Combating Substance Abuse Award from the Robert Wood Johnson Foundation, among many other honors. The Institute for Scientific Information has listed him as one of the world's most highly cited researchers.

Theresa B. Moyers, PhD, is Associate Professor of Psychology at the University of New Mexico, where she conducts research on treatments for addictive behaviors, with a focus on motivational interviewing (MI). Her primary interests are identifying the active ingredients of MI as well optimal methods for disseminating it in addictions settings. Dr. Moyers has published more than 35 peer-reviewed articles and has presented on MI and addictions treatment in 16 countries. She is a member of the Motivational Interviewing Network of Trainers. In addition to her academic pursuits, she trains and competes with her border collie in the sport of dog agility. Her website is www.theresamoyers.com.