Franklin D. Roosevelt (allthetropes.org)
Franklin Delano Roosevelt (1882-1945) was the longest serving President in US History, serving three full terms and starting his fourth when he died. No other President had even won a third term (a couple had tried — Grant and T.R. — but none were elected). And, thanks to the 22nd Amendment, no President since will be able to challenge his length of service (barring the very unlikely event of the 22nd being repealed).- Franklin D. Roosevelt (Wikipedia)
Franklin Delano Roosevelt (/ˈdɛlənoʊ ˈroʊzəvɛlt, -vəlt/ DEL-ə-noh ROH-zə-velt, -vəlt; January 30, 1882 – April 12, 1945), commonly known as FDR, was an American statesman and political leader who served as the 32nd president of the United States from 1933 until his death in 1945. He previously served as the 44th governor of New York from 1929 to 1933, the Assistant Secretary of the Navy from 1913 to 1920, and a member of the New York State Senate from 1911 to 1913.