James O. Prochaska, PhD, led the Cancer Prevention Research Center and was professor of clinical psychology at the University of Rhode Island. As the codeveloper of the transtheoretical, or stages of change, model, he is one of the top five most cited authors in psychology.
Janice M. Prochaska, PhD, is cofounder and former CEO of Pro-Change Behavior Systems, Inc.
Walter Dixon is a winner of Audible's "#1 Editor's Choice and Customer Favorites" award. He has narrated more than 200 audiobooks; performed in musical theater, drama and opera productions, and professional stand-up comedy; and voiced commercials, corporate videos, animated features, and vintage radio dramas.