Christopher R. Martell, PhD, ABPP, is Clinic Director of the Psychological Services Center at the University of Massachusetts Amherst, and Lecturer in the Department of Psychological and Brain Sciences. He is board certified in Clinical Psychology and in Behavioral and Cognitive Psychology through the American Board of Professional Psychology. He has led workshops around the world on behavioral activation and other topics. Dr. Martell is a Fellow of the American Psychological Association and the Association of Behavioral and Cognitive Therapies. He is a recipient of the Distinguished Psychologist Award from the Washington State Psychological Association, and has received honors and recognition as an instructor and clinical supervisor. He was a full-time practicing clinician for over 24 years prior to devoting his time to teaching, supervision, and research consultation. Sona Dimidjian, PhD, a clinical psychologist, is Director of the Renée Crown Wellness Institute and Professor in the Department of Psychology and Neuroscience at the University of Colorado Boulder. She is a widely recognized expert on women’s mental health; the clinical application of contemplative practices, such as mindfulness meditation; and cognitive and behavioral approaches. She has developed successful prevention and treatment programs to promote mental health and wellness in health care, education, and community settings. Dr. Dimidjian is a recipient of multiple awards and the author of widely cited scholarly papers. Her most recent books include the self-help resource Expecting Mindfully as well as Behavioral Activation for Depression, Second Edition, and Evidence-Based Practice in Action (for mental health professionals). Ruth Herman-Dunn, PhD, is in private practice in Seattle and supervises graduate students in her position as Clinical Associate Professor in the Department of Psychology at the University of Washington. She has been a research therapist on several large randomized clinical trials for behavioral treatments, including behavioral activation and dialectical behavior therapy, and has led workshops on these treatments throughout the United States and Canada. Dr. Herman-Dunn provides consultation on treatment dissemination studies and collaborates with a core group of behavioral activation experts on training and treatment development.