Michael E. Addis PhD, is associate professor of psychology at Clark University in Worcester, MA. He received his PhD from the University of Washington in 1995. He has published over forty scientific articles and books on topics including depression, the relationship between research and practice in clinical psychology, and men's mental health. In 1997, he received the President's New Researcher Award from the Association for the Advancement of Behavior Therapy. In 2003, he received the researcher of the year award from the Society for the Psychological Study of Men and Masculinity, and the American Psychological Association's David Shakow Award for early career contributions to the science and practice of clinical psychology. Christopher R. Martell, PhD, ABPP, is a licensed psychologist, and is board certified in clinical, behavioral, and cognitive psychology through the American Board of Professional Psychology. He is clinic director of the Psychological Services Center, and lecturer at the University of Massachusetts Amherst. Martell has coauthored eight books, and has authored or coauthored numerous articles and chapters on behavioral activation.