This online therapist guide gives clinicians the information they need to treat clients who exhibit the symptoms of PTSD. It is based on the principles of Prolonged Exposure Therapy, the most scientifically-tested and proven treatment that has been used to effectively treat victims of all types of trauma. Clients are exposed to imagery of their traumatic memories, as well as real-life situations related to the traumatic event in a step-by-step, controllable way, and through this, will learn to confront the trauma and begin to think differently about it, leading to a marked decrease in levels of anxiety and other PTSD symptoms. Clients are provided education about PTSD and other common reactions to traumatic events. Breathing retraining is taught as a method for helping the client manage anxiety in daily life. Designed to be used in conjunction with the corresponding online client workbook, this therapist guide includes all the tools necessary to effectively implement the prolonged exposure program including assessment measures, session outlines, case studies, sample dialogues, and homework assignments.