"[2] Mannheim points out social class, location and generation as the greatest determinants of knowledge.
[3] Both Mannheim and Georg Lukács were forced into exile after the rise of Horthy as Regent of Hungary.
The list of reviewers of the German Ideology and Utopia includes a remarkable roll call of individuals who became famous in exile, after the rise of Hitler: Hannah Arendt, Max Horkheimer, Herbert Marcuse, Paul Tillich, Hans Speier, Günther Stern (aka Günther Anders), Waldemar Gurian, Siegfried Kracauer, Otto Neurath, Karl August Wittfogel, Béla Fogarasi, and Leo Strauss.
[citation needed] Out of all of his works, Mannheim's Ideology and Utopia was the most widely debated book by a living sociologist in Germany during the Weimar Republic.
[4] This work has been a standard in American-style international academic sociology, carried by the interest it aroused in the United States.