Question: who served as president of the united states from 1901 to 1909
Answer: Theodore Roosevelt Jr. ( / ˈroʊzəvɛlt / ROH - zə - velt ; October 27 , 1858 -- January 6 , 1919 ) was an American statesman , author , explorer , soldier , and naturalist , who served as the 26th President of the United States from 1901 to 1909 .