Pierre-Louis Lions (11th August, 1956) is a French mathematician. He was awarded a doctorate by the University of Paris VI – Pierre et Marie Curie in 1979, for his thesis entitled Sur quelques classes d'équations aux dérivees partielles non linéaires et leur résolution numérique (On certain types of nonlinear partial differential equations and their numerical solution) and directed by Prof. Haïm Brèzis.
His current research efforts are focused on the theory of nonlinear partial differential equations. In 1994 he received the Fields Medals for research he completed while he was at the Paris-Dauphine University. Lions was the first person to entirely solve and provide a demonstration of the Boltzman equation. He received the Fields medal at the ICM (International Congress of Mathematicians) held in Zurich in 1994.
In addition to the Fields medal, the awards he has received include: the IBM prize (1987) and the Philip Morris prize (1991). He also had the honour to serve as a plenary speaker at the 49th “British Mathematical Colloquium”. He received an honoris causa doctorate from the Heriot-Watt University of Edinburgh (Scotland) and from the City University of Hong Kong.
He is currently professor of partial differential equations at the École de France and the École Polytechnique. He is also a member and Sponsor of the scientific Council of the IMDEA Mathematics Foundation.