1893 – 1962
Karl Nickerson Llewellyn (1893–1962) was an American jurist and legal theorist, widely regarded as the principal architect of American legal realism. He made foundational contributions to jurisprudence, commercial law, and the sociology of law, most notably co-drafting the Uniform Commercial Code and developing a systematic account of legal reasoning through 'situation sense' and the study of judicial precedent.
Principal drafter of the Uniform Commercial Code, transforming American commercial law
Leading theorist of American Legal Realism, emphasizing law-in-action over law-on-books
Developed the concept of 'situation sense' as a basis for judicial reasoning
Authored 'The Bramble Bush' and 'The Common Law Tradition', foundational texts in legal education and jurisprudence
Analyzed the 'leeways of precedent' and the role of legal craft in constraining judicial discretion