Eric Voegelin was a German-American political philosopher. He was born in Cologne, and educated in political science at the University of Vienna, where he became an associate professor of political science in the law faculty. In 1938, he and his wife fled from the Nazi forces which had entered Vienna. They emigrated to the United States, where they became citizens in 1944. He spent most of his academic career at Louisiana State University, the University of Munich and the Hoover Institution of Stanford University.

Hans Kelsen was an Austrian jurist, legal philosopher and political philosopher. He was the principal architect of the 1920 Austrian Constitution, which with amendments is still in operation. Due to the rise of totalitarianism in Austria, Kelsen left for Germany in 1930 but was forced out of his university post after the Nazi seizure of power in 1933 because of his Jewish ancestry. That year he left for Geneva and in 1940 he moved to the United States. In 1934, Roscoe Pound lauded Kelsen as "undoubtedly the leading jurist of the time". While in Vienna, Kelsen met Sigmund Freud and his circle, and wrote on social psychology and sociology.