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Ronald Dworkin was the successor to H.L.A. Hart as Professor of Jurisprudence at the University of Oxford. Dworkin's work in legal philosophy is often seen as a reaction to Hart's positivist views on law, and he developed a theory of law based on the idea of rights. Dworkin's work has been influential in legal philosophy, and he is considered one of the most important legal philosophers of the 20th century.