PERSON
H. L. A. Hart
The Oxford legal philosopher who spent his life asking what a rule actually is—and built, without knowing it, the exact instruments needed to understand what AI systems can and cannot do when they apply rules to the lives of millions.
H. L. A. Hart took the concept of a rule—the thing we assume we understand because we obey thousands of them a day—and showed how strange, layered, and consequential it actually is. His 1961 masterwork
The Concept of Law dismantled the picture of law as commands backed by threats and replaced it with an architecture: a union of primary rules that tell people what to do, and secondary rules that tell us how to identify, change, and apply the primary rules. That architecture, and the distinctions it generates—between following a rule and merely behaving regularly, between a rule’s settled core and its open-textured penumbra where language gives out, between legal validity and moral merit, between being obligated and being obliged—has become the most precise vocabulary available for the questions
algorithmic governance now forces on us. AI systems are, in Hart’s terms, almost entirely primary-rule machines: they apply rules to cases but conspicuously lack the