The Hoover Institution is an American public policy think tank and research institution located at Stanford University in California. Its official name is the Hoover Institution on War, Revolution, and Peace. It began as a library founded in 1919 by Republican Herbert Hoover, before he became President of the United States. The library, known as the Hoover Institution Library and Archives, houses multiple archives related to Hoover, World War I, World War II, and other world history. According to the 2014 Global Go To Think Tank Index Report (Think Tanks and Civil Societies Program, University of Pennsylvania), Hoover is #19 (of 60) in the "Top Think Tanks in the United States".