Dave Grossman is a retired U.S. Army Lt. Colonel, West Point Psychology Professor, Professor of Military Science, Army Ranger, and lifelong SF fan. He started his military career as a paratrooper and a sergeant before attending OCS. Colonel Grossman is the author of the Pulitzer nominated book, On Killing, which is used as required reading in courses at military academies, police academies, and colleges worldwide. He has written many other scholarly and popular works, and since his retirement from the military in 1998, he now travels the world almost 300 days a year, training elite military and law enforcement organizations.