James O. Prochaska is director of the Cancer Prevention Research Center and professor of clinical and health psychology, both at the University of Rhode Island. He is the author of over 200 publications, including three books, Changing for Good, Systems of Psychotherapy and The Transtheoretical Approach. He is internationally recognized for his work as a developer of the stage model of behaviour change. He is the principal investigator on over $60 million in research grants for the prevention of cancer and other chronic diseases. In addition, he has served as a consultant to the American Cancer Society, Centers for Disease Control, Health Maintenance Organizations, the British National Health Service, major corporations, and numerous universities and research centres. Dr. Prochaska has won numerous awards, including the Top Five Most Cited Authors in Psychology from the American Psychology Society and an Innovator’s Award from the Robert Wood Johnson Foundation, and is the first psychologist to win a Medal of Honor for Clinical Research from the American Cancer Society.