Theodore Roosevelt was the 26th President of the United States and was noted for his exuberant personality, achievements, and his leadership of the Progressive Movement. He was a leader of the Republican Party and founder of the first incarnation of the short-lived Progressive ("Bull Moose") Party of 1912. Before becoming President, he held offices at the city, state, and federal levels. Roosevelt's achievements as a naturalist, explorer, hunter, author, and soldier are as much a part of his fame as any office he held as a politician. Roosevelt was 42 years old when sworn in as President of the United States in 1901, making him the youngest president ever; he beat out the youngest elected president, John Fitzgerald "Jack" Kennedy, by only one year. Roosevelt was also the first of only three sitting presidents to have won the Nobel Peace Prize. The Teddy bear is named for him, despite his contempt for being called "Teddy".