Hans Kelsen
Hans Kelsen (; ; October 11, 1881 – April 19, 1973) was an Austrian jurist, legal philosopher and political philosopher. He was the author of the 1920 Austrian Constitution. Many of its amendments are still being used. The rise of totalitarianism in Austria, Kelsen left for Germany in 1930. He was forced out of his university job after the Nazi  took power in 1933 because of his Jewish ancestry. That year, he left for Geneva. In 1940, he moved to the United United States. In 1934, Roscoe Pound said Kelsen was "undoubtedly the leading jurist of the time". While in Vienna, Kelsen met Sigmund Freud and wrote on social psychology and sociology.