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.