École pratique des hautes études
He became founder and director of the Cartographic Laboratory of the École pratique des hautes études (EPHE) in 1954 and director of studies (directeur d'études) in 1957. In 1967 he became professor of the Sorbonne, and in 1974 he became director of studies and director of the Geographical Laboratory of the École des hautes études en sciences sociales (EHESS), which is part of the École pratique des hautes études (EPHE, VIe Section). Later in the 1970s he became head of research at the Centre national de la recherche scientifique (CNRS).