Theodore "T.R." Roosevelt, Jr. (New York City, NY, October 27, 1858 - Oyster Bay, NY January 6, 1919) was an American author, naturalist, explorer, historian, and politician who served as the 26th President of the United States. He was a leader of the Republican Party (the "GOP") and founder of the Progressive Party. He is noted for his exuberant personality, range of interests and achievements, and his leadership of the Progressive Movement, as well as his "cowboy" persona and robust masculinity.