Stassen lost some of his political base while overseas, whereas Republican candidates such as Thomas E. Dewey had a chance to increase theirs. Stassen was a delegate at the San Francisco Conference that established the United Nations, and was one of the US signatories of the United Nations Charter. He served as president of the University of Pennsylvania from 1948 to 1953. His attempt to increase the prominence of the university football team was unpopular and soon abandoned. From 1953 to 1955, he was the director of President Dwight D. Eisenhower's short-lived Foreign Operations Administration.