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H.L.A. Hart was the Professor of Jurisprudence at the University of Oxford from 1952 to 1967. He was succeeded by Ronald Dworkin, who held the position from 1967 to 1997. Hart was a leading figure in the analytical jurisprudence tradition, and his work had a significant impact on legal theory. Dworkin was also a leading figure in legal theory, and his work developed and challenged Hart's views.