L. (Lassa) Oppenheim

Born near Frankfurt am Main on March 30, 1858, Lassa Francis Lawrence Oppenheim was a German jurist who later built his career in Britain. He studied law at several German universities, taught in Freiburg and Basel, and in 1895 moved to London to join the newly founded London School of Economics.

Oppenheim is best known for his clear, systematic approach to international law. His major work, International Law: A Treatise (1905–06), was highly influential and helped establish him as one of the central figures in the field, often described as a father of modern international law.

In 1908 he became Whewell Professor of International Law at Cambridge. He died in Cambridge on October 7, 1919, but his writing continued to shape legal thought long after his lifetime.