Walter Penk has served as a Clinical and Research Psychologist at VA Medical Centers in Houston, Dallas, Boston, and Bedford, Massachusetts. He held clinical faculty appointments at medical schools: Southwestern, Tufts, Boston University, University of Massachusetts, Harvard, and now Texas A&M. His specializes in psychosocial rehabilitation and PTSD, having published 135 papers, and coauthor of Returning Wars' Wounded, Injured, and Ill and Treating PTSD Among Military Personnel. He lives in New Braunfels, TX.