Kennan, GeorgeDiplomat and historian, born in Milwaukee, Wisconsin, USA. Educated at Princeton (1925 BA) and at the Berlin Seminary for Oriental Languages (1930), he served as US foreign service officer (1926–53) in Geneva, Hamburg, Berlin, Estonia, Latvia, Moscow, Vienna, Prague, Lisbon, and London. He also served as US ambassador to the USSR (1952) and Yugoslavia (1961–3), and in 1956 became a professor at the Institute for Advanced Study in Princeton. In 1947, using the pen name Mr X (because he was then with the State Department), he wrote a famous article in Foreign Policy, ‘The Sources of Soviet Conduct’, that effectively spelled out what would be the West’s policy of ‘containment’ toward Soviet Communism for the next 40 years.