Theodore "Teddy" Roosevelt (1858-1919) was the governor of New York before becoming the vice president of the United States. At age forty-two, Roosevelt became the youngest man to assume the US presidency after President William McKinley was assassinated in 1901. Beloved by the masses, Roosevelt fought for citizen fairness, railroad regulations, and national park conservation. In 1906, Roosevelt received the Nobel Peace Prize for his successful efforts to end the Russo-Japanese War. Besides his active career in politics, Roosevelt was an avid writer, publishing over ninety pieces in his lifetime, including Theodore Roosevelt: An Autobiography, The Naval War of 1812, and Rough Riders.