Lanteigne was a sole practitioner, while Héroux was a GNH Avocats partner
The federal government has announced the judicial appointments of Mario J. Lanteigne to the Trial Division of the New Brunswick Court of King’s Bench in Bathurst and David Héroux to the Quebec Superior Court in Baie-Comeau.
Sean Fraser – Canada’s justice minister, attorney general, and minister responsible for the Atlantic Canada Opportunities Agency – named the new appointees in news releases from the federal justice department.
Fraser wished Lanteigne and Héroux success as they assumed their new positions and expressed confidence that they would serve effectively upon joining the benches in the New Brunswick and Quebec courts.
Lanteigne replaced Justice Robert M. Dysart in Moncton, who was elevated to the Court of Appeal of New Brunswick as of Nov. 5, with the vacancy opening in Bathurst following internal court transfers.
Meanwhile, Héroux took the place of Justice Serge Francoeur in Baie-Comeau, who elected to serve as a supernumerary judge as of Oct. 29, 2024.
Biographies in the news releases provided more information regarding Lanteigne and Héroux.
Mario Lanteigne
According to his biography, Lanteigne launched a civil litigation practice as a sole practitioner in Bathurst in 2011. In 2009, he commenced a legal career focused on civil litigation alongside Harry H. Williamson.
While practising law, he served as a deputy clerk of the New Brunswick Court of King’s Bench in Bathurst’s judicial district for several years and as vice chair of the New Brunswick Workers’ Compensation Appeals Tribunal from 2020–22.
Lanteigne was also a lecturer in the philosophy of law at the University of Moncton Faculty of Law from 2024–25 and a member of the board of directors of the Association des juristes d’expression française du Nouveau-Brunswick from 2020–23. He joined the New Brunswick bar in 2009.
Before becoming a lawyer, he worked at the Canadian Cultural Centre in Paris from 1999–2001. At the Canadian Embassy in Paris, he served in the consular section in 2001 and in its political section from 2001–02.
Lanteigne has a general academic studies degree in philosophy from the University of Strasbourg, a bachelor’s degree in philosophy from Paris-1-Panthéon-Sorbonne University, a master’s degree in philosophy from Paris-Sorbonne University (Paris-IV), and a bachelor’s degree in law from the University of Moncton.
David Héroux
According to his biography, Héroux was a partner at Gauthier Neveu Héroux Avocats Inc. (GNH Avocats) in Sept-Îles, which he established in 2023. He maintained a general legal practice focusing on civil law, civil liability, insurance, labour, municipal, commercial, and Indigenous law.
He has acted for clients in most of Quebec’s judicial districts and before different administrative tribunals, the Superior Court of Quebec, the Court of Appeal of Quebec, the Court of Quebec, and the Federal Court of Canada.
In 2011, Héroux joined Cain Lamarre in Sept-Îles on Quebec’s North Shore. Before that, he worked at the legal services department of the Société des établissements de plein air du Québec. He joined Kronström Desjardins (now Langlois) in Quebec City after commencing his legal career with Laporte & Lavallée in Joliette.
He served as president of the Sept-Îles Uashat mak Mani-utenam Chamber of Commerce, president of the Barreau de la Côte-Nord, and director and president of the boards of various community organizations, namely the Centre de Ski Gallix, Club Richelieu international de Sept-Îles, Hommes Sept-Îles, and Développement économique Sept-Îles.
Héroux earned admission to the Quebec bar in 2000 and a bachelor’s degree in law from the University of Sherbrooke in 1999.
