Herbert Hoover (31st President, 1929–1933), Calvin Coolidge (30th President, 1923–1929), and James Buchanan (15th President, 1857–1861) all served as Presidents of the United States. Geraldine Ford was the wife of the 38th U.S. President, Gerald Ford, and served as the First Lady from 1974 to 1977. She herself never held the office of President.