Theodore Roosevelt (1858 - 1919), sometimes nicknamed Teddy, was an American statesman and member of the Republican Party (and co-founder of the dissident Progressive Party), president of the United States from 1901 to 1909 and winner of the Nobel Peace Prize in 1906. A man of frail health, he worked in a variety of occupations before and after his political involvement, including museum curator, writer, essayist, historian, military officer, naturalist and ornithologist. His presidency is considered to be one of the most important in American history. In the rankings made by historians and journalists, Theodore Roosevelt is considered one of the greatest presidents and was always ranked in the top eight. His effigy was reproduced on Mount Rushmore alongside Presidents George Washington, Thomas Jefferson and Abraham Lincoln.