Melanie Aitken is the Managing Principal of Bennett Jones (US) LLP, which carries on the practice of Canadian law in Washington, DC, in association with Bennett Jones LLP. She is also head of the competition and foreign investment practice of Bennett Jones. She specializes in global antitrust and competition law and litigation, working closely with colleagues in our Toronto and other offices.

Melanie served as Canada’s Competition Commissioner, in charge of the Canadian Competition Bureau from 2009 to 2012, having previously served as the Senior Deputy Commissioner leading merger review from 2006 to 2009.

While serving as Commissioner, Melanie led many high-impact civil and criminal matters and worked extensively with leaders of international antitrust authorities around the world on enforcement and policy cases, holding leadership roles in key international organizations, such as the Steering Committee of the International Competition Network. Melanie is credited with revitalizing the Bureau as an active enforcement agency. Most notably, she led the introduction of major amendments to Canada’s competition laws, introducing a US-style second request merger review process in Canada, and a new per se criminal cartel offence. While establishing an unprecedented successful litigation record for the Bureau, Melanie initiated a landmark case that liberalized the Canadian real estate industry, brought cases forward in significant matters (including a challenge to Visa and MasterCard over card acceptance rules, and a challenge to a major airline merger to monopoly); during her tenure, the Bureau won the first court-ordered merger prohibition since the 1990s.

Melanie was a partner at Bennett Jones and Davies Ward Philips & Vineberg before joining the Bureau in 2005. She has acted as counsel in the Supreme Court of Canada and represented the merging parties in Canada's leading efficiencies case, Superior Propane. Melanie has an active antitrust advisory, trial and commercial practice, representing major Canadian and US companies in significant matters across a broad range of industries, including financial services, large retail, telecommunications, pharmaceutical, airlines, oil and gas and consumer products.

Melanie's recent experience includes Counsel to: SLB in its US$8-billion acquisition of ChampionX; Amazon in its US$8.45-billion acquisition of MGM; Tervita Corporation in its C$2.3-billion merger with Secure; Seagen in its US$43-billion acquisition of Pfizer Inc.; Kissner in its US$3.2-billion acquisition of Windsor Salt; JBS Food Canada in its defense to class action alleging price-fixing; CP in its US$31-billion acquisition of KCS; Tiffany & Co. in its US$16-billion sale to LVMH; Mylan N.V. in its US$12-billion combination with Pfizer Inc.’s Upjohn business; American Airlines in its defense to class action alleging capacity discipline; Bristol-Myers Squibb in its US$74-billion acquisition of Celgene; Allergan plc. in its US$63-billion sale to AbbVie; Fiserv, Inc. in its US$22-billion acquisition of First Data; Time Warner it its US$85-billion acquisition by AT&T; Alere, Inc. in its US$5.3-billion acquisition by Abbott; St. Jude Medical Inc. in its US$25-billion acquisition by Abbott; Starwood Hotels & Resorts Worldwide, Inc. in its US$12.2-billion acquisition by Marriott International, Inc; and Air Transat in its transformative joint venture with Porter Airlines.

Melanie is currently Chair Elect of the Antitrust Section of the American Bar Association (Chair 2026-2027). She is also a frequent speaker and commentator on competition issues, and has taught as an Adjunct Professor at Osgoode Hall and Queen's Law Schools. She is active on the C.D. Howe Institute's Competition Policy Council, and sits on the Advisory Boards of the Global Antitrust Institute, Schulich School of Business (Toronto, Canada), and W@CompetitionAmericas, and has been appointed a Fellow of the American Bar Foundation. Melanie also serves as a non-governmental advisor to the International Competition Network, a network of the world's competition authorities fostering convergence to best practices in global antitrust enforcement.

Melanie L. Aitken

Managing Principal, Bennett Jones (US) LLP • Head of Competition, Antitrust & Foreign Investment Practice

Insights