Lenard is remembered as a strong German nationalist who despised English physics, which he considered as having stolen their ideas from Germany. During the Nazi regime, he was the outspoken proponent of the idea that Germany should rely on "Deutsche Physik" ("Aryan physics") and ignore the (in his opinion) fallacious and perhaps deliberately misleading ideas of "Jewish physics", by which he meant chiefly the theories of Albert Einstein, including "the Jewish fraud" of relativity. An advisor to Adolf Hitler, Lenard became Chief of Aryan Physics under the Nazis. He was expelled from his post at the University of Heidelberg by Allied occupation forces in 1945.