The Hidden Hitler is the English-language version of the 2001 book Hitlers Geheimnis. Das Doppelleben eines Diktators (Hitler's Secret: The Double Life of a Dictator) by German-Jewish professor and historian Dr. Lothar Machtan. The original book was published in Germany by Alexander Fest Verlag, while the English-translated version was published by Basic Books in New York City. (ISBN 0-465-04308-9) The question of Hitler's homosexuality is also raised in Walter C. Langer's pioneering work The Mind of Adolf Hitler and in Waite's psychoanalytic history The Psychopathic God: Adolf Hitler.