About Deeth Williams Wall LLP

Deeth Williams Wall LLP is a small, specialized law firm based in Toronto's financial district at 150 York Street. It was founded over 30 years ago by four lawyers, Douglas Deeth, Gervas Wall, Marijo Coates, and Amy-Lynne Williams, who left larger firms to build something different. As the firm puts it, the founders believed "there had to be a better way to treat our clients, our lawyers and staff." The practice has grown from its original seven lawyers to about twenty.

The practice concentrates on intellectual property, technology, and regulatory law. That covers patent, trademark, copyright, trade secret, and industrial design work, along with information technology matters such as artificial intelligence, privacy, cybersecurity, and Canada's anti-spam law. On the regulatory side, lawyers at the firm advise on food and drug, medical device, natural health product, cosmetics, and telecommunications rules, and its litigators handle patent and trademark disputes, including pharmaceutical patent cases under Canada's Notice of Compliance regulations. Clients range from Canadian technology start-ups to multinational corporations, provincial government bodies, and healthcare institutions, across industries that include pharmaceuticals, food, chemicals, automotive, and retail.

In the community

  • Publishes E-TIPS, a newsletter on intellectual property, technology, and regulatory law developments, with an online archive of issues dating back to 2002
  • Takes on one articling student and one to two summer law students most years, under Law Society of Ontario program guidelines

Good to know

A person using a wheelchairWheelchair accessible

This firm’s lawyers at a glance

Called to the bar
1976–2021 · median 30 years in practice 11 of 18 lawyers
Law schools
Osgoode Hall Law School (5), University of Toronto (4), University of Ottawa (2), Dalhousie University, University of Toronto Faculty of Law, University of Western Ontario Faculty of Law and 2 more 16 of 18 lawyers

Where to find them

150 York St., Suite 400, Toronto, Ontario M5H 3S5, Canada · 416-941-9440

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This listing was generated by AI from public sources in August 2026. It may contain errors, and we can’t guarantee it’s accurate or complete. Before you rely on anything here, verify it on the firm’s own website. Verify licence status in the Law Society of Ontario directory ↗

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