Jack Lang studied political science at the Institut d'Études Politiques de Paris, and went on to receive a postgraduate degree in public law. His career then focused on a combination of teaching and culture and the arts. He was the founder and producer of Festival du Monde in Nancy, was director of the Nancy University Theatre from 1963 to 1972, and then director of the Théâtre national de Chaillot from 1972 to 1974. At the same time he was a professor of international law from 1971 to 1981. He married Monique Buczynski in 1961. The couple have two daughters.