The topics he has written about include the German Youth Movement, Zionism, Israeli history, the cultural history of the Weimar Republic and Russia, Communism, the Holocaust, fascism, and the diplomatic history of the Cold War.
Ha escrito sobre muchos temas de la juventud Alemana, el Sionismo, Historia de Israel, la República de Weimar y Rusia, comunismo, el Holocausto, fascismo y de la Guerra Fría.