Raz Gross, MD, MPH received his M.D. degree from Tel Aviv University. After training in medicine and residency in psychiatry, Dr Gross moved to New York where he completed a 3-year postdoctoral fellowship in Psychiatric Epidemiology at Columbia University, and also received his Masters in Public Health degree. Dr Gross is currently an Assistant Professor of Epidemiology and Psychiatry at Columbia. He is involved in studies of workers who participated in the clean-up and recovery effort at ground zero after September 11, and of the mental health consequences of 9/11 on primary care patients in