After receiving his doctorate from the Université de Paris, he taught French at the Royal Military College of Canada in Kingston, Ontario (1920-1923).

From 1926 to 1954 he taught French and French-Canadian literature at the University of Ottawa, later being named professor emeritus.

He authored 20 studies, including a nine-volume collection entitled Les Lettres canadiennes d’autrefois (published between 1939 and 1958).

He was a member of the Royal Society of Canada (1934), the Académie canadienne-française and the Société des Dix (1962).

The Société Saint-Jean-Baptiste de Montréal awards the Prix Séraphin-Marion annually.