Born in Paris, Aubert came to Brittany in 1893 when he got a job as assistant editor of the journal Réveil Breton in Saint-Brieuc.
He published Le Livre de la Bretagne in 1901 and wrote numerous works for the theatre in Saint-Brieuc.
In 1922, he created the monthly journal La Bretagne touristique, which covered far more than just tourist issues, promoting historical and contemporary Breton culture.
His book Légendes traditionnelles de la Bretagne retold many local legends, concentrating on those about the history of Breton Christianity.
From 1934, he was president of the committee for the construction and decoration of the Breton pavilion for the 1937 Exposition Internationale des Arts et Techniques dans la Vie Moderne.