Theodore Roosevelt Jr. (/ˈroʊzəvɛlt/ ROH-zə-velt;[b] October 27, 1858 – January 6, 1919), often referred to as Teddy or by his initials, T. R., was an American politician, statesman, soldier, conservationist, naturalist, historian, and writer who served as the 26th president of the United States from 1901 to 1909. He previously served as the 25th vice presidentunder President William McKinley from March to September 1901 and as the 33rd governor of New York from 1899 to 1900. Assuming the presidency after McKinley’s assassination, Roosevelt emerged as a leader of the Republican Party and became a driving force for anti-trust and Progressive policies.

Theodore Roosevelt

Portrait by the Pach Brothers, c. 1904
26th President of the United States
In office
September 14, 1901 – March 4, 1909
Vice President