About Dewart Gleason LLP

Dewart Gleason LLP is a small litigation firm in downtown Toronto, founded in 2010 by partners Sean Dewart and Tim Gleason. The firm's website lists about 14 lawyers who've appeared before every level of court in Canada, including the Supreme Court of Canada, and before administrative tribunals across the province. Its practice centres on civil litigation, labour and employment law, civil rights, and administrative law and professional regulation, with a particular focus on defending lawyers facing professional liability claims.

The firm represents dozens of Canada's largest public and private sector trade unions in bargaining, arbitration, and litigation, and it also acts for the Law Society of Ontario in professional regulation proceedings, work that has earned its lawyers a reputation for representing other lawyers. Sean Dewart was lead counsel in the police accountability cases Jane Doe v. Toronto Police and Hill v. Hamilton Police, and holds an LL.B. from Osgoode Hall Law School (1983) and an LL.M. from the London School of Economics (1985).

Milestones & recognition

  • Dewart Gleason LLP was founded in 2010 by partners Sean Dewart and Tim Gleason.
  • Tim Gleason is a past chair of the Ontario Bar Association's Labour Relations and Employment Law Section and a former contributing editor of Ontario Labour Relations Board Law and Practice, 3rd edition.
  • Tim Gleason has testified before Parliament's Finance Committee.

In the community

  • Tim Gleason has served as an adjunct professor at the University of Toronto Faculty of Law, teaching advanced labour law.
  • The firm's administrative law practice includes pro bono work on civil and human rights matters.

Good to know

A person using a wheelchairWheelchair accessible

This firm’s lawyers at a glance

Law schools
Osgoode Hall Law School (6), University of Toronto (2) 8 of 15 lawyers
Languages on the roster
Cantonese, English, French, Spanish

The neighbourhood

Dewart Gleason's office is in the Capitol Building at 366 Adelaide Street West, a seven storey structure built in 1920 as the Hobberlin Building, one of a group of warehouse lofts constructed for Toronto's garment industry near Spadina Avenue. The building's yellow brick facade and Art Deco terracotta tile on the seventh floor survive from the original construction.

Frequently asked questions

Does Dewart Gleason represent trade unions in Ontario?
Yes. The firm represents dozens of Canada's largest public and private sector unions in collective bargaining, arbitration, and litigation before labour relations boards and courts.
Can Dewart Gleason defend a lawyer facing a professional liability or negligence claim?
Yes, defending lawyers is a core focus of the firm. It's defended hundreds of lawyers in claims involving civil, criminal, and family law practitioners, corporate commercial and real estate lawyers, and arbitrators.
I was terminated from my job. Can Dewart Gleason help?
Yes. The firm represents employees who've been terminated or are in an employment dispute, offering a no cost intake interview and fee arrangements proportionate to the client's needs before negotiating a settlement or, if needed, litigating.
Does Dewart Gleason handle civil rights and Charter litigation?
Yes. The firm represents civil liberties groups and individuals and communities who've faced discrimination, taking cases through the courts and tribunals, including to the Supreme Court of Canada.
How many lawyers work at Dewart Gleason and where is the firm located?
The firm's website lists about 14 lawyers, all based at its single office at 366 Adelaide Street West, Suite 102, in downtown Toronto.
Does Dewart Gleason act for regulators or professional bodies, not just individuals?
Yes. The firm acts for the Law Society of Ontario in professional regulation proceedings and provides regulatory counsel to tribunals and professionals across sectors including health, immigration, and labour.

Where to find them

366 Adelaide Street West, Suite 102, Toronto, Ontario M5V 1R9 · 416-971-8000

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Listing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗