Allan Bullock (1914-2004) was a British academic and government historian noted for his work on Adolf Hitler. He was a research assistant to Winston Churchill and worked for the BBC. Bullock was founding master of St. Catherine's College and vice-chancellor of Oxford University.
For many years, his 1952 biography of Hitler, Hitler, a Study in Tyranny, was considered definitive. Over time, his interpretation of Hitler changed, emphasizing Hitler's goals and thinking, the "intentionalist" school of thought. Intentionalism is sometimes equated with ideology, but they differ. It is quite possible to have an intentionalism based principally on the ideas of one person, as, for example, the ideas in Mein Kampf. An ideology has to be usable by multiple adherents, and survive the death of its creator.