Anna Eleanor Roosevelt (/ˈɛlɨnɔr ˈroʊzəvɛlt/; October 11, 1884 – November 7, 1962) was an American politician, diplomat, and activist. She was the longest-serving First Lady of the United States, holding the post from March 1933 to April 1945 during her husband President Franklin D. Roosevelt's four terms in office. President Harry S.