École Nationale des Chartes.
He was the father of the novelist Frédérique Hébrard. After the War he was on the editorial board of the magazine Europe at the time of its revival in 1946. He was a curator at the Musée du Petit Palais, and (from 1959 to 1971) director of the Archives de France.
He was President of Poets, Playwrights, Editors, Essayists and Novelists association International, the worldwide association of writers, from 1956 to 1959.
He was elected to the Académie française on 17 May 1956 by 18 votes – including Jules Romains, André Maurois and Georges Duhamel – to succeed Ernest Seillière. In 1958, he was elected mainteneur of the Académie des Jeux floraux.
Chamson died in Paris in 1983.
Académie française; Félibrige. Deutsche Akademie für Sprache und Dichtung. Académie de Nîmes.