is a research director at Inria Saclay and part-time professor at Ecole Polytechnique. He is a statistician specialized in computational statistics and healthcare applications. He created and directed the Monolix team at Inria. He developed most of the algorithms implemented in the Monolix software. Marc Lavielle holds a Ph.D. in applied mathematics from Universitè Paris-XI, Orsay, France (1991). He was named Assistant Professor in 1991 and Professor in 1998 at Paris Descartes University, and joined Inria in 2007 and Polytechnique in 2015.