Recognized for his deep experience in managing intricate litigation, Guillaume’s practice focuses on public law matters, class actions and commercial disputes. He has represented clients at all levels of court, including the Supreme Court of Canada, and before tribunals.

Guillaume regularly acts in complex and high-profile cases that often involve administrative, constitutional, penal or regulatory ramifications, and frequently attract appellate review. He takes part in multiple class actions dealing with human rights, Crown liability or anti-competitive issues. He is also involved in injunctive or judicial review proceedings stemming from public sector bargaining processes or regulatory investigations. His work covers a wide range of fields, including the regulation of Crown corporations, professional ethics and discipline, the regulation of health care services, economic sanctions and consumer protection.

Guillaume is a former president of the Administrative, Constitutional and Human Rights Section of the Canadian Bar Association (Québec Branch), a member of the Steering Committee of the Laskin Moot in administrative and constitutional law, and a co-founder and former president of the Revue juridique étudiante de l’Université de Montréal.

Guillaume Charlebois

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