Étienne is counsel at the Crown Law Office – Criminal. He began his legal studies at McGill University, receiving the Faculty of Law’s Principal David L. Johnston Medal. Étienne holds a Master of Laws from the University of Cambridge, where he studied as a Cambridge Trust Scholar and graduated with first-class honours.
Étienne clerked for Chief Justice Wagner at the Supreme Court of Canada and for two judges at the Court of Appeal for Ontario. He has worked on public inquiries as a legal researcher and as counsel. His peer-reviewed publications centre on criminal law and public law more broadly.