Dionne, Jean-Philippe | Langlois Lawyers

Key practice areas

Litigation and Dispute Resolution, Securities Litigation, Public and Administrative Law, Financial Institutions and Financial Services Law, Constitutional Law

Québec Bar 2020

Montréal

+1 438 844 7813

jean-philippe.dionne@langlois.ca

Jean-Philippe Dionne’s practice focuses on civil and commercial litigation, particularly in contractual disputes, civil liability and product liability. He is also active in files involving public law.

Jean-Philippe is appreciated for his critical mind and exacting standards, and is frequently called upon in complex and large-scale files. He has thereby acquired significant expertise in representing clients before Québec and federal civil courts and administrative tribunals. Jean-Philippe is involved at all stages of litigation files. He assists a varied clientele in finding solutions to their disputes that are adapted to their sector and reality.

During his law studies, Jean-Philippe was awarded several prizes and awards in recognition of his excellent academic results. In particular, he obtained the best cumulative average in his class for three consecutive years while earning his civil law degree. He also participated in the 2018 Laskin Moot Court Competition (in constitutional and administrative law), where his team was awarded second prize for best factums. He subsequently co-coached University of Ottawa’s Civil Law Section team in the Laskin Moot Court Competition in 2019 and 2020.

Defended a truck manufacturer against an action for latent defects brought by a municipality.
Defended a corporation and some of its shareholders in connection with a dispute arising from a sale of shares.
Defended a professional partnership before the Superior Court against a claim of over $7 million.

Osgoode Society for Canadian Legal History Award (awarded to the top ten students in the University of Ottawa's Common Law Section), 2019
Gold Medal and Law School Plaque (highest cumulative GPA in the entire Civil Law degree program – University of Ottawa), 2018

Co-author: “The SCC issues a landmark ruling on the territorial jurisdiction of Québec’s administrative tribunals”, November 30, 2023.
Co-author: “The Court of Appeal finds that the principle of proportionality does not extend the scope of the doctrine of forum of necessity”, October 13, 2022.
Co-author: “Bilingualism required? The New Brunswick Court of Queen’s Bench considers the appointment of a unilingual English speaking Lieutenant-Governor”, June 27, 2022.

Co-speaker: Arrêt Marcotte : enjeux constitutionnels en lien avec la LPC [The Marcotte ruling: Constitutional issues related to the CPA], Langlois Knowledge, webinar, December 8, 2022.

J.D., University of Ottawa, 2019

LL.L., University of Ottawa, 2018

B.A., summa cum laude, Political Science (Honours) with minor in Economics, McGill University, 2015

Featured Articles

Publications

November 30th, 2023

The SCC issues a landmark ruling on the territorial jurisdiction of Québec’s administrative tribunals

The recent ruling of the Supreme Court of Canada in Sharp v. Autorité des marchés financiers1 will have far reaching implications in the fields of administrative law, international private law, and securities law in Québec. Québec’s securities regulator, the Autorité des marchés financiers (“AMF”), brought proceedings before Québec’s Financial Markets Administrative Tribunal (“FMAT”) against four British […]

Publications

October 13th, 2022

The Court of Appeal finds that the principle of proportionality does not extend the scope of the doctrine of forum of necessity

On December 3, 2021, in Otsuka Pharmaceutical Company Limited c. Pohoresky,1 the Superior Court of Québec (the Honourable Suzanne Courchesne) determined that it had jurisdiction to hear a class action brought by non-residents of Québec directed, in part, against foreign defendants (the “Foreign Defendants”). According to the Superior Court, the doctrine of forum of necessity codified […]

Publications

June 27th, 2022

Bilingualism required? The New Brunswick Court of Queen’s Bench considers the appointment of a unilingual English speaking Lieutenant-Governor

On April 14, 2022, the Chief Justice of the New Brunswick Court of Queen’s Bench (the “Court”), Tracey K. DeWare, answered an important language rights question in Acadian Society of New Brunswick v. The Right Honourable Prime Minister of Canada:1 must the person who holds the office of Lieutenant-Governor of New Brunswick be bilingual? Background […]