Born in West St. Paul, Minnesota, Stassen was elected as the district attorney of Dakota County, Minnesota after graduating from the University of Minnesota. He won election as Governor of Minnesota in 1938. Stassen was then and remains the youngest person elected to that office. He gave the keynote address at the 1940 Republican National Convention. He resigned as governor to serve in the United States Navy during World War II, becoming an aide to Admiral William Halsey Jr. After the war, he became president of the University of Pennsylvania, holding that position from 1948 to 1953. Stassen sought the presidential nomination at the 1948 Republican National Convention, winning a significant share of the delegates on the first two ballots of the convention. During the Republican primaries preceding the convention, he engaged in the Dewey–Stassen debate, the first recorded debate between presidential candidates.