He is also Associate Director of the Behavioral Sciences Division of the National Center for Posttraumatic Stress Disorder at the Boston Department of Veterans Affairs Medical Center. Dr. Litz is Principal Investigator on several research studies funded by the National Institutes of Health and the Department of Defense to explore the efficacy of early intervention strategies in trauma, and he is currently studying adaptation to traumatic loss as a result of 9-11. In addition to conducting research on early intervention for trauma, Dr. Litz studies the mental health adaptation of U.S. military personnel across the lifespan, the assessment and treatment of posttraumatic stress disorder, and emotional numbing in trauma.