Guillaume has a Bachelor of Laws (B.C.L./LL.B.) from McGill University and was called to the bar in 2012. Before starting a career in law, Guillaume studied music at the Université de Montréal. He has a Master’s degree and completed doctorate courses in music (interpretation). During his studies in music, Guillaume received the silver Governor General’s Academic Medal, awarded to two students with the highest average in undergraduate programs.
His primary area of practice is in labour law, in collective labour relations and individual employment agreements. Guillaume has also developed an expertise in constitutional and administrative law. His work on cases involving fundamental rights and freedoms recently brought him to the Supreme Court of Canada in a case involving the right to strike.
Guillaume has also developed a particular skill set in a variety of topics including pension plans. His work focuses primarily on research and legal writing, and as such, touches on a variety of legal issues, maintaining a wide breadth of knowledge outside of labour law.