William Hardy McNeill was an American historian and author, noted for his argument that contact and exchange among civilizations is what drives human history forward, first postulated in The Rise of the West (1963). He was the Robert A. Millikan Distinguished Service Professor Emeritus of History at the University of Chicago, where he taught from 1947 until his retirement in 1987. In 1980-81 he held the George Eastman Professorship at the University of Oxford.
