Donald Houston > McCarthy Tétrault > Toronto, Canada > Lawyer Profile

McCarthy Tétrault
66 Wellington Street West
Suite 5300, TD Bank Tower Box 48
Toronto ON M5K 1E6

Work Department



Competition law and litigation practice includes defending criminal prosecutions, Competition Tribunal proceedings and private actions, including class actions. Has frequently represented the Commissioner of Competition. Significant cartel and merger practice, both domestic and international. Extensive experience litigating Competition Tribunal cases. Adjunct Professor at Western University Law School.


Former Chair of CBA National Competition Law Section; member of the ABA and IBA.

Lawyer Rankings

Canada > Competition and antitrust

(Leading individuals)

Donald HoustonMcCarthy Tétrault

McCarthy Tétrault has invested significantly in its competition and antitrust practice, and as such is well equipped to advise on the full range of matters in this field. The team often collaborates with the firm’s M&A department, providing merger control and foreign investment review services on major deals. Highlights in this space included Jason Gudofsky and Deborah Salzberger‘s advice to LSE Group on the $27bn acquisition of Refinitiv. On the investigations and litigation side it offers similar experience, having handled civil and criminal cartel investigations, deceptive advertising cases and class actions before federal courts and the Competition Tribunal. Its industry expertise is likewise broad, covering technology, transportation, financial services, real estate and other sectors. Gudofsky leads the practice from Toronto, and is known for his international work, both in foreign investment and national security reviews. Oliver Borgers is also notable for this type of work. Donald Houston leads litigation, with both civil court and class action experience. Dominic Thérien is a key contact in the Montréal office.