In 1952, Hart was elected Professor of Jurisprudence at Oxford and was a Fellow at University College, Oxford from 1952 to 1973. It was in the summer of that year that he began writing his most famous book, "The Concept of Law", though it was not published until 1961. In the interim, he published another major work, "Causation in the Law" (with Tony Honoré) (1959). He was president of the Aristotelian Society from 1959 to 1960. He gave the 1962 Master-Mind Lecture.