a professor at the university of montreal, he is particularly known for his contributions to the sources chrétiennes collection. he published alone or in collaboration 13 bilingual volumes, relating particularly to the trinity (hilary, "de trinitate"; basil, "contra eunomium"; and cyril of alexandria, "de trinitate dialogi") and to christology (cyril of alexandria, "de incarnatione", "quod unus sit christus").