Eileen Margaret McMahon

Working with entrepreneurs and innovators for over 30 years, Eileen is Chair of Torys’ Intellectual Property and Food and Drug Regulatory practices. She advises Fortune 500 companies, leading manufacturers and innovators, as well as small- and medium-sized enterprises, on complex intellectual property and regulatory issues. She is recognized as Canada’s leading life sciences lawyer, with deep market insight and a practical, business-minded approach.

Eileen is Chair of the intellectual property and food and drug regulatory practices at Torys. She represents the entire spectrum of companies on regulatory clearance and intellectual property protection of products. Across sectors—including life sciences (pharmaceuticals, medical devices, natural health products), agribusiness, consumer products and more—Eileen helps clients identify, protect and leverage IP and regulatory assets, obtain and maintain market exclusivity, handle high-risk situations (corrective actions, recalls, regulatory orders), and navigate the impact of current and proposed laws on clients’ ability to sell products. Eileen also has market-leading experience with patented medicines and oversight of Canada’s Patented Medicines Prices Review Board (PMPRB). Eileen also represents investors and companies looking to finance or invest in companies with intellectual property and regulatory assets, as well as companies looking to acquire or divest such assets.

Eileen’s unique experience and strong market presence are well recognized: in addition to her Band 1 ranking in Intellectual Property by Chambers & Partners, Eileen is the only Canadian lawyer to be recognized as a Star Individual in Life Sciences. Managing IP regards her as one of the world’s top 250 women in IP, and The Legal 500 recognizes her as one of Canada’s leading lawyers in intellectual property. Eileen is recognized as a “Hall of Fame Lawyer” by The Legal 500 Canada , which noted that she receives “constant praise from her clients for continued excellence” and is “at the pinnacle of the profession.” Best Lawyers in Canada also recognized Eileen as Lawyer of the Year in Biotechnology and Life Sciences for 2024.