John W. Leopold

Marc-André G. Fabien, Ad. E. is a seasoned litigator and Fellow of the American College of Trial Lawyers recognized for his mastery of high-profile complex litigation. He specializes in commercial and shareholders’ disputes, securities litigation and penal proceedings, and litigation involving federal, provincial and municipal bodies. In addition, he is the President of the Canadian Paralympic Committee. Marc-André appears before all levels of courts, including the Supreme...

Robert is a partner of the firm and heads its Tax department and Wills, Trusts and Estates department. He received both his Bachelor of Civil Law and Common Law from McGill University in 1989 and later completed a Graduate Diploma in Taxation at McGill University. Robert practices in the area of tax with a focus on income tax planning for Canadian private corporations and their owners, corporate reorganizations and tax dispute resolution. Robert is regularly involved in estate and succession ...

Julie Carlesso’s practice covers all aspects of civil and commercial litigation. In 2017, she represented the interests of Québecor Média inc. and Le Devoir before the Commission d'enquête sur la protection de la confidentialité des sources journalistiques (investigative committee on protection of media sources), presided by Mr. Justice Jacques Chamberland. Before joining the Montréal office, she clerked for the Honourable Richard Wagner of the Supreme ...

Jean-François Gagnon is the Chief Executive Officer of Langlois Lawyers. He is also a member of the firm’s Executive Committee and Board of Directors. His practice focuses on complex commercial litigation, corporate governance, strategy, crisis management, ethics and deontology. He has wide-ranging experience in matters involving directors’ and officers’ liability, the management of not-for-profit organizations, construction law and insurance law. Jean-François...

Marie-France Tozzi is a lawyer recognized by Best Lawyers in the practice area of Class Action Litigation. Marie-France practices law in Montréal, Quebec Best Lawyers has recognized Marie-France Tozzi since 2025. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Marie-France Tozzi is held by other lawyers.

With over 30 years’ experience in business law, Mireille Fontaine practices mainly in private equity, venture capital, mergers and acquisitions, securities Law and fund formation. She is a seasoned business advisor, recognised for her legal and business acumen, her availability, and her efficiency. She helps her clients achieve and exceed their most ambitious objectives. In addition, Mireille specialized in cross-border transactions namely between Canada and the United States, as well a...

Philippe St-Louis is a lawyer recognized by Best Lawyers in the practice areas of Corporate Law, Mergers and Acquisitions Law and Venture Capital Law. Philippe practices law in Montréal, Quebec Best Lawyers has recognized Philippe St-Louis since 2022. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Philippe St-Louis is held by other lawyers.

Richard Gaudreault is a partner in the Labour and Employment Law Group. He frequently acts as a negotiator in the negotiation of collective agreements and a strategic advisor in the planning and reorganization of human resources for large private corporations, as well as public and parapublic institutions. In his practice, Mr. Gaudreault has developed specific skills in managing complex cases involving crisis management issues and developing internal communication plans. An experienced litiga...

Nicolas Gagnon specializes in construction law and surety law. He counsels public and private sector clients, professional services firms and contractors as well as surety companies at every stage of construction projects. He advises clients with respect to the public bidding and procurement process, and is involved in the drafting of contract documents and the management of the work and any claims resulting therefrom. He also counsels syndicates of co-owners in matters dealing with divided c...

Danilo Di Vincenzo is a partner-owner in the firm. He started his career in the Legal Services department of the Commission des normes du travail (now CNESST), where he acquired valuable hands-on experience. He counsels and represents employers, particularly, in matters of grievance arbitration and collective bargaining. Mr. Di Vincenzo was trained in the Harvard Negotiation Program focusing on interest-based bargaining and conflict resolution. He is also a legal instructor, lecturer and regu...