Roosevelt Jr. (/ˈroʊzəvɛlt/ ROH-zə-velt; October 27, 1858 – January 6, 1919), often referred to as Teddy Roosevelt or his initials T.R., was an American statesman, politician, conservationist, naturalist, and writer who served as the 26th president of the United States from 1901 to 1909. He served as the 25th vice president from March to September 1901 and as the 33rd governor of New York from 1899 to 1900. Roosevelt emerged as a leader of the Republican Party and became a driving force for the anti-trust policy while supporting Progressive Era policies in the United States in the early 20th century. Theodore Roosevelt Jr. was born on October 27, 1858, at 28 East 20th Street in Manhattan, New York City. He was the second of four children born to socialite Martha Stewart 'Mittie' Bulloch and businessman and philanthropist Theodore Roosevelt Sr. (brother of Robert Roosevelt and James A. Roosevelt, all sons of Cornelius Roosevelt).