[1] His brother, Louis Le Cardonnel, was a Roman Catholic priest and poet.
[1] Le Cardonnel co-authored a book about contemporary French literature with Charles Vellay in 1905.
[2] They based their study on the criticisms of Gaston Deschamps, Jean Ernest-Charles, Émile Faguet, and Charles Maurras, among others.
[1] Meanwhile, he was a contributing critic in La Revue Universelle, Les Marges, Gil Blas, L'Opinion, among other reviews.
[1] At the beginning of World War II, Le Cardonnel worked for Agence Havas.