1907 – 1992
H.L.A. Hart (1907–1992) was a British legal philosopher and the most influential figure in twentieth-century analytic jurisprudence. As Professor of Jurisprudence at Oxford, he revitalized legal positivism through a sophisticated account of law as a system of primary and secondary rules, drawing on ordinary language philosophy. His work reshaped debates on the relationship between law, morality, and coercion.
Authored The Concept of Law (1961), the definitive modern statement of legal positivism
Distinguished primary rules (imposing obligations) from secondary rules (conferring powers), solving classical problems in jurisprudence
Introduced the 'rule of recognition' as the foundation of a legal system's validity
Conducted the landmark Hart–Fuller debate on law's necessary connection to morality
Defended a liberal harm principle against legal moralism in the Hart–Devlin debate