Stéphane Nonnenmacher is a professor of mathematics at Paris-Saclay University and has served as director of the Graduate School of Mathematics since September 2024. A member of the Orsay Mathematics Laboratory (LMO – CNRS/Paris-Saclay University), his research focuses primarily on spectral analysis, dynamical systems, and quantum chaos, at the intersection of mathematics and theoretical physics. He also served as director of the Hadamard Doctoral School of Mathematics (EDMH).