The SCOR Foundation for Science organized an online conference on Tuesday the 28th of June 2022, from 5:30 to 7:00 pm, on “Mathematical Models of Dynamic Equilibria for Large Populations, and their Applications”, with Pierre-Louis Lions, member of the Scientific Board of the SCOR Foundation for Science, Fields Medal (1994), graduate of the Ecole Normale Supérieure (Mathematics), Professor at the Collège de France, where he holds the chair in Partial Differential Equations and their applications, and Professor of applied mathematics at the École Polytechnique.