In Traumatic Events and Mental Health, Dr. O’Brien presents a thoughtful clinician’s review of the literature and the data on the relationship of trauma to mental health. As he says in chapter 6, "Not everyone who is exposed to trauma develops post-traumatic illness; not all post-traumatic illness is Post-Traumatic Stress Disorder." In different chapters, the author introduces the diagnosis of trauma-related illness, describes the normal reaction to trauma, and summarizes the epidemiology of PTSD. In addition, he discusses the relationship of stressors and predisposing factors and, most important, posttraumatic illness other than PTSD. Chapters also address assessment, management and outcome, medicolegal aspects, and prevention of posttraumatic illness.