Theodore Roosevelt was the 26th President of the United States, serving from 1901 to 1909. He was a leader of the Republican Party and a prominent figure in American politics during the Progressive Era. Roosevelt is known for his progressive domestic policies, trust busting, and conservationism. He also greatly expanded the powers of the presidency, leading to the modern executive branch of government. He is remembered for his larger-than-life personality and his famous quote, 'Speak softly and carry a big stick.'