Jennifer J. Vasterling, PhD, is the Associate Director for Research for the Department of Veterans Affairs South Central Mental Illness, Research, Education, and Clinical Center and is a clinical professor of psychiatry and neurology at Tulane University School of Medicine. Dr. Vasterling's research has focused on the application of neuropsychological assessment methods to the study of PTSD in military veterans and on examination of the neuropsychological outcomes of military deployment. Chris R. Brewin, PhD, is Emeritus Professor of Clinical Psychology at University College London. His clinical specialization is in the treatment of PTSD. Dr. Brewin is the author of Posttraumatic Stress Disorder: Malady or Myth? (2003).