Theodore Roosevelt (pron.: // ROH-zə-velt; October 27, 1858—January 6, 1919) was the 26th President of the United States (1901–1909). 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. 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 F. 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 after him, despite his dislike of being called "Teddy".
Under the United States Constitution, the President of the United States is the head of state and head of government of the United States. As chief of the executive branch and head of the federal government as a whole, the presidency is the highest political office in the United States by influence and recognition. The president is also the commander-in-chief of the United States Armed Forces. The president is indirectly elected to a four-year term by an Electoral College (or by the House of Representatives should the Electoral College fail to award an absolute majority of votes to any person). Since the ratification of the Twenty-second Amendment to the United States Constitution in 1951, no person may be elected President more than twice, and no one who has served more than two years of a term to which someone else was elected may be elected more than once. Upon the death, resignation, or removal from office of an incumbent President, the Vice President assumes the office. The President must be at least 35 years of age and a "natural born" citizen of the United States.