John Keegan was born in London, England on May 15, 1934. He received a degree in history from Balliol College, Oxford in 1953. After graduation, he went to the United States on a grant to study the Civil War. When he returned to London, he wrote political reports for the United States Embassy and in 1960 was appointed as a lecturer at the Royal Military Academy at Sandhurst, England, a post he held for 25 years. During this time he also held visiting professorships at Princeton University and Vassar College. In 1997, he began working for the Daily Telegraph as a defense correspondent and then military affairs editor. He also contributed to the American website National Review Online. During his lifetime, he wrote more than 20 books about military history, the majority of which focus on warfare from the 14th to the 21st centuries. His works included Barbarossa: Invasion of Russia, The Face of Battle, A History of Warfare, Who Was Who in World War II, The Second World War, The American Civil War, The Mask of Command, and The Iraq War. He was been knighted in 2000. He died on August 2, 2012 at age of 78.