Stéphane Mallat was a professor at the Courant Institute of Mathematical Sciences from 1988 to 1994. In 1995, he became professor of Applied Mathematics at the Ecole Polytechnique. From 2001 to 2007 was the CEO of a semiconductor start-up "Let It Wave" he co-founded. In 2012, he became professor at the École Normale Supérieure, then in 2017 professor at the Collège de France. Stéphane Mallat is a member of the Academy of Sciences, the Academy of Technologies and the American National Academy of Engineering. His research concerns harmonic analysis and the processing of large dimensional data.