Theodore D. Roosevelt (October 27, 1858 – January 6, 1919), also known as T.R., and to the public (but never to friends and intimates) as Teddy, was the 26th President of the United States. A leader of the Republican Party and of the Progressive Party, he was a Governor of New York and a professional historian, naturalist, explorer, hunter, author, and soldier. He is most famous for his personality: his energy, his vast range of interests and achievements, his model of masculinity, and his "cowboy" image. Originating from a story from one of Roosevelt's hunting expeditions, teddy bears are named after him.
As Assistant Secretary of the Navy, Roosevelt prepared for and advocated war with Spain in 1898. He organized and helped command the 1st U.S. Volunteer Cavalry Regiment—the Rough Riders—during the Spanish-American War. Returning to New York as a war hero, he was elected governor. An avid writer, his 35 books include works on outdoor life, natural history, the American frontier, political history, naval history, and his autobiography.