Sylvain’s 30-year long practice is focused on commercial, administrative and constitutional litigation, particularly on native law issues. He handles several class actions. He regularly pleads before the federal and provincial courts, as well as commissions and governmental boards. He has taught administrative law at the University of Ottawa, the Université de Montréal and for the Barreau du Québec. He has also made presentations at a number of conferences and written numerous articles on civil procedure, civil law and native law.