Natural law
Natural law jurisprudence is currently undergoing a period of reformulation (as is legal positivism). The most prominent contemporary natural law jurist, Australian John Finnis, is based in Oxford, but there are also Americans Germain Grisez, Robert P. George, and Canadian Joseph Boyle and Brazilian Emídio Brasileiro. All have tried to construct a new version of natural law. The 19th-century anarchist and legal theorist, Lysander Spooner, was also a figure in the expression of modern natural law.