Eileen McMahon

Eileen M. McMahon

Toronto: 416.865.7676
Fax 416.865.7380


LLB, 1985
Osgoode Hall Law School
BSc (Biochemistry and Chemistry), 1982
University of Toronto

Bar Admissions

Ontario, 1987


Eileen McMahon, a member of Torys’ Executive Committee, is the Chair of Torys' Intellectual Property and Food and Drug Regulatory Practices. She practices exclusively in the areas of intellectual property and food and drug regulatory law. She is one of a handful of Canadian lawyers who advise on regulatory clearance and intellectual property protection of products. Eileen is a registered patent and trademark agent in the United States and Canada.

Eileen’s experience includes strategic advice on identifying intellectual property and regulatory assets; obtaining and maintaining market exclusivity using intellectual property and regulatory laws; exploiting intellectual property assets; and enforcing intellectual property rights.

Eileen is also a Certified Licensing Professional of the Licensing Executive Society (LES) (2011-2020), 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.

Representative Work

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Best Lawyers' Best Lawyers in Canada—Leading lawyer in biotechnology and intellectual property (2006-2018)

Chambers & Partners’ Chambers Canada—Leading lawyer in Canada, intellectual property (2016-2018)

Lexpert/American Lawyer's Guide to the Leading 500 Lawyers in Canada—Leading practitioner in biotechnology law (2007-2018)

Chambers & Partners’ Chambers Global: World’s Leading Lawyers for Business, The Client’s GuideLeading lawyer in intellectual property (2008-2017)

Managing Intellectual Property’s IP STARS Top 250 Women in IP (2017)

Best Lawyers' 2016 Biotechnology Law "Lawyer of the Year” in Toronto

The Legal 500 Canada—Leading lawyer in intellectual property (2015-2018)

LMG Life Sciences Star, 2015

Intellectual Asset Management's IAM Patent 1000: The World's Leading Patent Practitioners—Leading lawyer in transactions and prosecution (2012-2016)

Lexpert/Thomson Reuters' Canadian Legal Lexpert Directory—Leading lawyer in biotechnology and intellectual property (2008-2015)

Law Business Research’s Who’s Who Legal—Leading lawyer in life sciences regulatory (2008-2018), patents (2012-2017), intellectual property and product liability (2013)

Practical Law Company’s Which Lawyer?—Recommended Canadian practitioner in life sciences: regulatory and intellectual property (2010-2012)

Practical Law Company’s Which Lawyer?—Highly recommended Canadian practitioner in intellectual property law: litigation (and in the Cross-Border Intellectual Property Handbook 2008/07); highly recommended life sciences practitioner in regulatory matters and in intellectual property (2008-2009)

Practical Law Company’s Cross-border Life Sciences Handbook—Highly recommended practitioner in life sciences (2007-2008)

Intellectual Asset Management's IAM Licensing 250: The World's Leading Patent and Technology Licensing Lawyers—Leading lawyer globally (2010-2017)

Martindale-Hubbell’s Peer Review Ratings AV Preeminent Rated Lawyer—Exemplary ethical standards and legal ability

Martindale-Hubbell’s Bar Register of Preeminent Women Lawyers—Highest possible rating in both legal ability and ethical standards from her peers (Martindale-Hubbell recognizes fewer than 5% of women lawyers with this preeminent rating) (2011-2013)

Globe Business Publishing's World Trademark Review—Recommended Canadian expert in trademarks (2009–2011)

Lexpert/Thomson Canada’s Guide to the Top 100 Industry Specialists in Canada—Leading lawyer in pharmaceuticals and in biotechnology law (2006, 2016-2017)

Women’s Executive Network—One of Canada's 100 Most Powerful Women (2005)



Professional Involvement

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. Eileen has mentored twice in the WXNWisdom Top 100 mentoring program. This program matches Canada’s Top 100 award winners with young women from across Canada for mentoring.


Centre for Addiction and Mental Health (CAMH)—Member of the Board of Trustees

Credit Valley Hospital—Member of the Board of Trustees
Canadian Healthcare Licensing Association—Member of the Board of Directors, Founding Officer & Director

Memberships and Affiliations

Intellectual Property Institute of Canada
Intellectual Property Owners Association
Food and Drug Law Institute—Medical Devices Committee
American Intellectual Property Law Association
Licensing Executives Society
Centre for Addiction and Mental Health (CAMH)—Member of the Board of Trustees