Theoretical chemist who received the Nobel Prize in Chemistry in 1998 for his development of computational methods in quantum chemistry. He worked as a professor at both Carnegie Mellon University and Northwestern.
He won a scholarship to Trinity College, Cambridge, where he received a B.A. in 1946.
He was made a Knight Commander of the Order of the British Empire in 2003.
He had four children with his wife Joy Bowers, who he married in 1952.
He won the Nobel Prize in Chemistry the year before Ahmed Zewail did.