- He was the Professor of Jurisprudence at the University of Oxford.
- He wrote several books — the most famous was The Concept of Law (1961).
- This book was republished with a posthumous (i.e. after his death) postscript in 1994.
- In The Concept of Law, Hart explains his theory of law.
- He also criticized others’ ideas. For example, he criticized John Austin’s theory. He wrote that Austin’s command theory did not take account of the “variety of laws” in a legal system.
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