Joseph Raz (Hebrew: יוסף רז; born 21 March 1939) is an Israeli legal, moral and political philosopher. He is one of the most prominent advocates of legal positivism. He has spent most of his career as professor of philosophy of law and a fellow of Balliol College, Oxford, and has also, for the past dozen years, been a professor of law at Columbia University Law School. Raz, now retired from Oxford, is currently also a visiting professor of law at King's College London. Several of Raz's students have become important legal and moral philosophers, including the two current Professors in Jurisprudence at Oxford, John Gardner and Leslie Green.