Lt. Col. Dave Grossman, has five patents to his name, has published four novels, two childrens’ books, and six non-fiction books to include his “perennial bestseller” On Killing (with over half a million copies sold), and a New York Times best-selling book co-authored with Glenn Beck. His books are “required” or “recommended” reading in all four branches of the US Armed forces, and in federal and local law enforcement academies nationwide.