David R. Petriello is an historian and author. He received his PhD from St. John's University, where he focused on American History and the effect of disease on history. He current...view moreDavid R. Petriello is an historian and author. He received his PhD from St. John's University, where he focused on American History and the effect of disease on history. He currently teaches at Caldwell University. His most recent book was Bacteria and Bayonets: The Impact of Disease in American Military History.view less