Christopher Martell, PhD, clinic director of the Psychological Services Center at the University of Massachusetts, Amherst, is author of two textbooks on behavioral activation (BA) for therapists, and coauthor (with Michael Addis, PhD) of the client workbook on BA, Overcoming Depression One Step at a Time: The New Behavioral Activation Approach to Getting Your Life Back. He has conducted behavioral activation workshops and trainings for therapists around the world.
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