Pierre Pansu

Pierre Pansu (born 13 July 1959) is a French mathematician and a member of the Arthur Besse group and a close collaborator of Mikhail Gromov. He is a professor at the Université Paris-Sud 11 and the École Normale Supérieure in Paris. His main research field is geometry.
He is the great-son of French physician Félix Esclangon, and the great great-nephew of mathematician and astronomer Ernest Esclangon, inventor of the talking clock, and brother of Robert Pansu, chemist and research director at CNRS.