लेखक: Matthew Jakupcak

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.