Marks & Clerk
20 lawyers · City of Toronto
One of 2,345 law firms listed in Toronto, and one of 195 handling Intellectual Property.
About Marks & Clerk
Marks & Clerk is an international intellectual property firm that traces its history to 1887, when it set up its first office in the UK. It has grown into a network of offices across the United Kingdom, continental Europe, Asia, and North America. In 2007 the firm's China practice, founded in 1994 as Lloyd Wise, merged into the Marks & Clerk network, extending its reach into East Asia.
The firm's Canadian practice dates to 1921, giving it more than a century of continuous operation in the country. It works from two offices, in Ottawa and Toronto, with about 25 lawyers and patent and trademark agents supported by more than 50 additional staff. The Toronto office, at 33 Yonge Street in the city's financial and legal district, handles patent prosecution, trademark and copyright work, and IP litigation. Its patent agents draw on technical backgrounds in electronics, computer science, artificial intelligence, chemistry, pharmaceuticals, and biotechnology, and the office also acts for clients in fashion, entertainment, and consumer goods.
Practice areas
Milestones & recognition
- The firm was founded in 1887, when it set up its first office in the UK.
- Its first Canadian office opened in 1921, and the firm has practised in the country for more than a century.
- In 2007 the firm's China office, founded in 1994 as Lloyd Wise, merged into the Marks & Clerk network.
- The firm now operates offices across the United Kingdom, continental Europe, Asia, and Canada.
In the community
- Several of the firm's Canadian practitioners hold committee and leadership positions with the Intellectual Property Institute of Canada, the American Intellectual Property Law Association, AIPPI, and the International Trademark Association.
- One of the firm's partners has served as Co-Chair of the Ontario Bar Association's Pro Bono Committee and as Chair of the Canadian Bar Association's Intellectual Property Section.
- A lawyer at the firm has lectured in the IPIC and McGill University summer IP courses, and firm partners mentor students and early career lawyers through programs such as OJEN mock trials.
Good to know
Wheelchair accessible
By appointmentLawyers 20
Alexis Vaughan
Amrita V. Singh
Amylee Hu-Fouye
Avery Lee
Cat Lovrics
Partner, Head of Trademark and Copyright Groups, Canadian Trademark Agent
Intellectual Property
Christopher Bury
David A. Ruston
Partner, Group Head of Patents (Canada), Canadian Patent Agent
Intellectual Property
Evangellos Vekris
Jonathan Colombo
Canadian Managing Partner, Barrister and Solicitor, Canadian Trademark Agent
Intellectual Property
Kamleh J. Nicola
Kevin Shipley
Kimberley Frith-Delisser
Maria Wei
Nikki Davy
Paul Horbal
Partner, Head of Electrical & Computer, Lawyer and Canadian Patent Agent
Intellectual Property
Robert A. McNaughton
Shuang Ren
Walter Chan
Wilfred So
Yuelin Ren
This firm’s lawyers at a glance
- Called to the bar
- 2008–2022 · median 11 years in practice 2 of 20 lawyers
- Law schools
- Osgoode 1 of 20 lawyers
Who handles what
The neighbourhood
The Toronto office is at 33 Yonge Street, Suite 300, in the heart of the city's financial and legal district, close to the courts. That's a fitting location for a practice whose Canadian work includes IP litigation.
The building at that address went up in 1982 on the corner of Yonge and Front Streets, replacing the six storey Toronto Board of Trade Building that had stood there since 1892, one of the city's earliest skyscrapers. The block sits at the southern edge of the Financial District, in a stretch of downtown that has been home to the city's business and trade institutions for well over a century.
Frequently asked questions
- What kind of legal work does Marks & Clerk handle in Toronto?
- The Toronto office focuses on intellectual property work: patent prosecution, trademark and copyright matters, and IP litigation.
- Does Marks & Clerk only work with large corporations?
- No. Its Toronto client base includes multinational corporations, small Canadian and international businesses, universities and other research institutions, and individual inventors.
- What technical backgrounds do the firm's patent agents have?
- The Toronto team's technical expertise spans electronics, computer science, artificial intelligence, chemistry, pharmaceuticals, and biotechnology, alongside IP work for the fashion, entertainment, and consumer goods industries.
- How long has Marks & Clerk practised in Canada?
- Its first Canadian office opened in 1921, so the firm has been practising IP law in the country for more than a century.
- Is the Toronto office part of a larger firm?
- Yes. Marks & Clerk is an international IP firm with offices across the UK, continental Europe, Asia, and Canada, tracing its own history back to 1887.
Where to find them
33 Yonge Street, Suite 300, Toronto, Ontario M5E 1G4 · 416-595-1155
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Administrative & Regulatory LawCivil Litigation & Dispute ResolutionListing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗