Eileen McMahon > Torys > Toronto, Canada > Lawyer Profile


Work Department

Intellectual Property


Eileen’s market-leading experience, practical advice and industry insight in intellectual property and regulatory law make her a go-to advisor for clients in Canada and the United States.

Chair of Torys’ Intellectual Property and Food and Drug Regulatory practices, Eileen is one of a handful of Canadian lawyers who advise on regulatory clearance and intellectual property protection of products. Across sectors—including life sciences, agribusiness, regenerative medicine and stem cells, cannabis and more—Eileen helps clients identify IP and regulatory assets, obtain and maintain market exclusivity, exploit IP assets and enforce their IP rights.

Eileen is a registered patent and trademark agent in the United States and Canada and is adroit at navigating the issues at play in cross-border matters. She is also a Certified Licensing Professional of the Licensing Executive Society (LES) (2011-2014), United States and Canada. This certification is issued only to persons who have met the requirements for licensing professionals, established by CLP, Inc., under the guidance of the LES. Fewer than 1% of all attorneys have this certification, making Eileen a specialized resource for clients.


Ontario Bar, 1987


Eileen is a co-leader of a healthcare licensing course accredited by the Canadian Healthcare Licensing Association and endorsed by the Toronto Biotechnology Initiative on licensing and strategic alliances in the healthcare industry.

As one of Canada’s Top 100 Most Powerful Women (Women’s Executive Network), Eileen participates in the Wisdom II Mentoring Program, which matches Canada’s Top 100 award winners with young women from across Canada for mentoring.

Lawyer Rankings

Canada > Cannabis

The team at Torys specializes in medical cannabis matters and is equipped to advise on the full spectrum of medicinal issues, including IP, commercial and regulatory issues. The practice is also known for its cross-border offering, with experts located in both its Canadian and US offices. Together, Eileen McMahon and Cheryl Reicin lead the practice. McMahon is a regulatory and IP expert in matters concerning cannabis products and accessories. In addition, she was elected by the Food and Drug Law Institute to be a keynote speaker at its conference, ‘Legal and Practical Issues in the Evolving World of Cannabis Regulation’. Reicin’s clients include the whole spectrum of life science companies, including start-ups, venture capitalists, academic medical centres and cannabis and cannabinoid-based companies.

Canada > Intellectual property

(Hall of Fame)

Eileen McMahonTorys

Torys has been especially active in the life sciences sector of late though also caters to names from the retail, agriculture, food, technology, media, sports, telecommunication and gaming industries, among others, serving as a one-stop shop across the full lifecycle of IP mandates. Eileen McMahon is a patent agent in both the US and Canada with 30 years of experience under her belt; she co-leads the team from Toronto alongside acquisition, exploitation and enforcement specialist, Edward Fan, and Andrew Shaughnessy who enjoys a prominent track record in patent and trademark infringement litigation, including those before the Supreme Court of Canada. Teresa Reguly supports clients involved in the sale of regulated pharmaceutical, medical device and biotechnology products with Andrew Bernstein delivering significant prowess in patent, copyright and trademark disputes, including those within the IT, media and life sciences industries. At the more junior end, counsel Nicole Mantini is a further star name on the contentious side and is highly regarded among international and North American pharmaceutical companies.