The 30th president of the United States was Calvin Coolidge. He served from 1923 to 1929, assuming office after the sudden death of President Warren G. Harding. Coolidge was sworn in by his father, a notary public, at their family home in Vermont in the early hours of August 3, 1923. He was known for his conservative, small-government policies and his reputation for personal integrity and frugality. Coolidge was elected to a full term in 1924 and chose not to seek re-election in 1928. His presidency is noted for economic prosperity during the 1920s, tax cuts, and limited government intervention, though his legacy is mixed due to the onset of the Great Depression shortly after he left office