Elizabeth McCauley, PhD, ABPP, is Professor in the Department of Psychiatry and Behavioral Sciences at the University of Washington (UW), with adjunct appointments in Psychology and Pediatrics, and Director of the Mood and Anxiety Program at Seattle Children’s Hospital. Her clinical and research work focuses on the development and treatment of depression and suicidality in young people. She has developed and tested a number of prevention and intervention strategies, including leading a project funded by the National Institutes of Mental Health to test the efficacy of behavioral activation (BA) as a treatment for adolescent depression. Dr. McCauley is a past president of the Society for Child and Adolescent Psychology. Kelly A. Schloredt, PhD, ABPP, is Attending Clinical Psychologist in Child Psychiatry and Behavioral Medicine and Clinical Director of the Psychiatry and Behavioral Medicine Unit at Seattle Children’s Hospital, and is Clinical Professor in the Department of Psychiatry and Behavioral Sciences at UW. Dr. Schloredt is actively engaged in professional activities including management and administration, teaching, patient care, and supervision and training. She was a research therapist on the Adolescent BA Program study led by Elizabeth McCauley. Gretchen R. Gudmundsen, PhD, is Assistant Professor in the Department of Psychiatry and Behavioral Sciences at UW and Attending Clinical Psychologist in Child Psychiatry and Behavioral Medicine at Seattle Children's Hospital. She has published numerous articles on the treatment of depression and the role of stress and coping in depressive disorders. Dr. Gudmundsen provides direct outpatient care in addition to conducting supervision and training. She has been a research therapist on several projects on the treatment of adolescent mood disorders and was awarded a Klingenstein Third Generation Fellowship for Child and Adolescent Depression. Christopher R. Martell, PhD, ABPP, is the Director of the Psychological Services Center at the University of Massachusetts Amherst, where he is also a Lecturer. He maintained an independent practice for 23 years, providing cognitive-behavioral therapy to clients with mood and anxiety disorders. Dr. Martell conducts workshops and trainings on behavioral activation (BA) nationally and internationally and has consulted on research teams examining BA around the world. His books include Behavioral Activation for Depression: A Clinician's Guide (coauthored with Sona Dimidjian and Ruth Herman-Dunn). He is a recipient of honors including the Distinguished Psychologist Award from the Washington State Psychological Association. Sona Dimidjian, PhD, a clinical psychologist, is 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 well-being among women, including during pregnancy and early parenting. Dr. Dimidjian is a recipient of multiple awards and the author of widely cited scholarly papers. She is coauthor of the self-help resource Expecting Mindfully as well as Behavioral Activation for Depression and Behavioral Activation with Adolescents (for mental health professionals).