John Frank Rook

John F. Rook, KC, is a highly esteemed senior litigation counsel with over 50 years of experience in administrative, commercial, and competition law. Recognized by Chambers Global as one of Canada's most sought-after competition litigators and by Best Lawyers in the practice areas of Class Action Litigation, Competition/Antitrust Law, Corporate and Commercial Litigation, with a specific focus on Litigation, he has appeared before provincial and federal courts, including the Supreme Court of Canada, and tribunals such as the Competition Tribunal, the Canadian Radio-Television and Telecommunications Commission, and the National Energy Board.

John has acted as counsel in landmark cases, including mergers, abuse of dominance, cartels, and class actions under the Competition Act. Notably, he represented Videotron in its acquisition of Freedom Mobile and advised the Commissioner of Competition on the Labatt-Lakeport Brewing merger. Beyond competition law, he has extensive expertise in securities, telecommunications, energy, product liability, negligence, and fiduciary claims.

John is cited by clients and peers in leading legal directories for his skill and creativity:

John has advised on many of the most noteworthy matters that have shaped common law jurisprudence and competition regulation in Canada, including:

John has also been designated as a Fellow of the Chartered Institute of Arbitrators.

" Competition Bureau Draft Guidelines: Is Efficiency on Life-Support? " — C.D. Howe Institute, March 25, 2026