He studied at the Titu Maiorescu high school, in Bucharest (1943 – 1948) and the Athénée Royal d'Ixelles (1948 – 1950). At the ULB (1950 – 1958) he studied chemistry and obtained a PhD in 1958. He started his academic career in 1957 at the ULB as an assistant (with Prof. Ilya Prigogine) at the Service de Physique Théorique et Mathématique. He became a professor at the ULB in 1964. He worked on the statistical physics of charged particles (Bălescu-Lenard collision operator) and on the theory of transport of magnetically confined plasmas. In 1970 he was awarded the Francqui Prize on Exact Sciences. In 2000 he received the Hannes Alfvén Prize.