Edna B. Foa, PhD, is a Professor of Psychiatry at the University of Pennsylvania and Director of the Center for the Treatment and Study of Anxiety in the Perelman School of Medicine, at the University of Pennsylvania. Dr. Foa has devoted her academic career to studying the psychopathology and treatment of anxiety and related disorders, primarily Posttraumatic Stress Disorder (PTSD) and obsessive-compulsive disorder (OCD). The treatment program she developed for PTSD has received the highest evidence for its efficacy and has been widely disseminated in the US and around the world. Elizabeth A. Hembree, PhD, is Associate Professor of Psychology in the Department of Psychiatry, Perelman School of Medicine, at the University of Pennsylvania. Dr. Hembree's clinical work and research have been primarily focused on anxiety disorders and on the psychological impact of trauma, the treatment of individuals with trauma-related disorders, and the dissemination of cognitive behavioral treatment for Posttraumatic Stress Disorder. Barbara Olasov Rothbaum, PhD, ABPP is a Professor in Psychiatry and Associate Vice Chair of Clinical Research at the Emory School of Medicine in the Department of Psychiatry and Behavioral Sciences, and director of the Emory Healthcare Veterans Program and the Trauma and Anxiety Recovery Program at Emory; she also holds the Paul A. Janssen Chair in Neuropsychopharmacology. Dr. Rothbaum specializes in research on the treatment of individuals with anxiety disorders, particularly focusing on Posttraumatic Stress Disorder. Sheila A.M. Rauch, PhD, ABPP, is Professor of Psychology in the Department of Psychiatry and Behavioral Sciences at the Emory University School of Medicine. She serves as Clinical Director of the Emory University Veterans Program and Director of Mental Health Research and Program Evaluation at the VA Atlanta Healthcare System. Dr. Rauch has been conducting research on and providing treatment for PTSD and anxiety disorders for over 20 years, and has been training providers in PTSD treatment since 2000.