David B. Rosengren, PhD, is President and CEO of the Prevention Research Institute, a private nonprofit organization in Lexington, Kentucky. He is a clinical psychologist with a broad background in treatment, research, training, and administration. He has served as a research scientist and consultant at the University of Washington’s Alcohol and Drug Abuse Institute and as an MI consultant and trainer. Dr. Rosengren helped to establish the Motivational Interviewing Network of Trainers, an international association representing more than a thousand MI trainers spread across 35 countries and six continents. His research interests include mechanisms of change for clients and practitioners, training methods, and implementation and dissemination science. He has authored journal articles and book chapters on addictions, MI, training, and the change process.