George Kennan Diplomat and Historian Princeton Class of 1925 Princeton University Princeton NJ USA photo: Courtesy of Princeton University Archives (c. 1961-1963) George Kennan concluded a long and distinguished diplomatic career as ambassador to Yugoslavia from 1961 to 1963. He is pictured here on the right with, from left, fellow Princeton alumnus Adlai Stevenson '22, who was ambassador to the United Nations at the time, and Yugoslavian President Marshal Josip Tito.