Roger Penrose is the son of scientist Lionel S. Penrose and Margaret Leathes , and the brother of mathematician Oliver Penrose and correspondence chess grandmaster Jonathan Penrose . Born in Colchester , Essex , England , Roger Penrose is a son of Lionel S. Penrose and Margaret Leathes . Penrose is the brother of mathematician Oliver Penrose and of chess Grandmaster Jonathan Penrose .