Dr. Pietrzak completed a B.A. in Psychology at Clark University, and M.P.H. in Epidemiology and Ph.D. in Clinical Psychology with specialization in Clinical Neuropsychology at the University of Connecticut. Following a clinical internship at the VA Connecticut Healthcare System, Dr. Pietrzak joined the faculty of the Department of Psychiatry at Yale University School of Medicine and Clinical Neurosciences Division of the National Center for Posttraumatic Stress Disorder. His primary research interests include the epidemiology of traumatic stress and resilience across the lifespan; the relationship between psychopathology and cognitive function, and neuropsychological assessment methodology. He is also interested in the application of advanced statistical approaches such as confirmatory factor analysis, latent class analysis, and latent class trajectory analyses in these research areas. Current projects Dr. Pietrzak is working on include: (1) studies of PTSD symptom structure that use CFA; (2) epidemiologic study that is using LCA to examine personality dimensions associated with treatment outcomes in PTSD; and (3) Studies that are using LCT/GMM analysis to examine trajectories of PTSD and depressive symptoms in older adults affected by Hurricane Ike; and in a sample of WTC responders.