Howard Zinn was an American historian, author, playwright, and social activist. He was a political science professor at Boston University for 24 years and taught history at Spelman College for 7 years. Zinn wrote more than 20 books, including his best-selling and influential A People's History of the United States. He wrote extensively about the civil rights and anti-war movements, and labor history of the United States. His memoir, You Can't Be Neutral on a Moving Train, was also the title of a 2004 documentary about Zinn's life and work.