Deborah Roth Ledley, PhD, is a psychologist in private practice in suburban Philadelphia. She spent several years on the faculty of the University of Pennsylvania’s Center for the Treatment and Study of Anxiety. Dr. Ledley’s research has focused on the nature and treatment of anxiety. She has published over 50 scientific papers and book chapters as well as several books, including Making Cognitive-Behavioral Therapy Work, Third Edition; Improving Outcomes and Preventing Relapse in Cognitive-Behavioral Therapy; Becoming a Calm Mom; and The Worry Workbook for Kids. She lectures widely on the treatment of childhood anxiety. Brian P. Marx, PhD, is a staff psychologist at the National Center for Posttraumatic Stress Disorder (PTSD), Veterans Affairs Boston Healthcare System, and Professor of Psychiatry at Boston University School of Medicine. Dr. Marx has written numerous articles and book chapters on behavior therapy and assessment. His research interests include the assessment and treatment of PTSD, identifying risk factors for posttraumatic difficulties, and the association between PTSD and suicidal behaviors. Richard G. Heimberg, PhD, is the Thaddeus L. Bolton Professor of Psychology and Director of the Adult Anxiety Clinic of Temple at Temple University. He is past president of the Association for Behavioral and Cognitive Therapies (ABCT) and the Society for a Science of Clinical Psychology (SSCP) and former editor of the journal Behavior Therapy. Well known for his efforts to develop and evaluate cognitive-behavioral treatments for social anxiety and other anxiety disorders, Dr. Heimberg has authored several books and 450 articles and chapters. As an educator and mentor of clinical psychology doctoral students, he has received awards from ABCT, SSCP, the Society of Clinical Psychology, and the American Psychological Association of Graduate Students.