[10] In 1932, Robert received a teaching position in Historical Geography of the Hellenic World at the École pratique des hautes études (IVth section) in Paris.
[4] In 1939, he was also made full professor at the Collège de France, where he took up the chair in Greek Antiquity and Epigraphy vacated at the death of his mentor Maurice Holleaux in 1932.
[23][24] While his work emphasised regional divergences and local human agency, it also tended – due to Robert's romanticised approach to geographical exploration – to underestimate the historical mutability of landscape.
Robert's key interests included the ancient economy and religion, Hellenisation and Romanisation, and the transformations of Late Antiquity, but his impact within the discipline of Classics has been limited by his excessive focus on detail and has endured most visibly in the fields of epigraphy and historical geography.
The Académie des Inscriptions et Belles-Lettres preserves his archive of notes, photographs, correspondence, estampages, and numismatic material as Fonds Louis Robert.