He published Le Livre de la Bretagne in 1901 and wrote numerous works for the theatre in Saint-Brieuc.
He also organised many conferences.
Interested in promoting tourism, he founded the first tourist office 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.
In 1921, he published Contes d'un Breton Adoptif (Tales of an Adopted Breton).
Aubert was the president of the Chamber of commerce in CĂ´tes-du-Nord from 1930 to 1945.
He was close friends with Breton writers Charles Le Goffic and Anatole Le Braz and was a member of the cultural movement Seiz Breur.
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.
He died in Saint-Brieuc.