Shortly after the initiation of the drafting of the UN Charter on 25 April 1945 in San Francisco, Kelsen began the writing of his extended 700-page treatise on the United Nations as a newly appointed professor at the University of California at Berkeley ("The Law of the United Nations", New York 1950). In 1952, he also published his book-length study about international law entitled "Principles of International Law" in English, and reprinted in 1966. In 1955, Kelsen turned to a 100-page essay, "Foundations of Democracy," for the leading philosophy journal "Ethics"; written during the height of Cold War tensions, it expressed a passionate commitment to the Western model of democracy over soviet and national-socialist forms of government.