Following the publication of The Hidden Hitler by the historian and University of Bremen professor Lothar Machtan, Hamann investigated claims about Hitler's homosexuality and appears in the 2004 HBO documentary film, Hidden Fuhrer: Debating the Enigma of Hitler's Sexuality, by the American documentarians Fenton Bailey and Randy Barbato.
Hidden Führer: Debating the Enigma of Hitler's Sexuality is a documentary film based on the research of German Professor Lothar Machtan for his 2001 book The Hidden Hitler that claimed Adolf Hitler was a homosexual.
In discussing his book in The Washington Post, Machtan told his interviewer that his research showed that some of Hitler's homosexual friends in Munich were the ones who opened many important doors for him, especially Ernst Röhm, Dietrich Eckart, and Ernst Hanfstaengl.
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He has been a guest lecturer at international conferences and symposia and a consultant for German TV programs such as Varzin – Warcino – Ein unbequemes Erbe (Warcino – An uncomfortable legacy, 1989).
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