Lax O'Sullivan Lisus Gottlieb LLP

11 Best Lawyers awards

Lax O'Sullivan Lisus Gottlieb LLP logo

Awarded Practice Areas

Professional Malpractice Law Administrative and Public Law Alternative Dispute Resolution Appellate Practice Bet-the-Company Litigation Class Action Litigation Commercial Leasing Law Corporate and Commercial Litigation Director and Officer Liability Practice Franchise Law Product Liability Law Real Estate Law Securities Law
*Named the "Lawyer of the Year" in this practice area in the 2026 edition in Toronto.

Biography

Described by his peers as ‘the gold standard in this space, a phenomenal litigator’, for more than thirty years Jonathan has won landmark decisions across a broad variety of subject matter including competition law, constitutional law, liability of public authorities, professional liability, criminal law, financial services, franchise law and contract disputes. He has tried over 90 cases to judgment and argued over 55 appeals in provincial appellate courts and the Supreme Court of Canada.

Jonathan regularly appears as Special Counsel to the Canadian Civil Liberties Association in challenges to government action. He is a Fellow of the American College of Trial Lawyers, the International Academy of Trial Lawyers, a member of the Chief Justice of Ontario’s Advisory Committee on Professionalism, and a member of the Supreme Court Advocacy Institute, a select group of appointed advocates who provide pro bono peer review to counsel appearing in the Supreme Court of Canada. He maintains an active trial and appellate practice across Canada.


Lax O'Sullivan Lisus Gottlieb LLP

11 Best Lawyers awards

Lax O'Sullivan Lisus Gottlieb LLP logo

Overview

Client Testimonials

Awards & Focus

Lawyer of the Year Badge - 2026 - Professional Malpractice Law Lawyer of the Year Badge - 2025 - Bet-the-Company Litigation
Named "Lawyer of the Year" by Best Lawyers® for:
  • Professional Malpractice Law, Toronto, Canada (2026)
  • Bet-the-Company Litigation, Toronto, Canada (2025)
Recognized in The Best Lawyers in Canada 2026 for work in:
  • Administrative and Public Law
  • Alternative Dispute Resolution
  • Appellate Practice
  • Bet-the-Company Litigation
  • Class Action Litigation
  • Commercial Leasing Law
  • Corporate and Commercial Litigation
  • Director and Officer Liability Practice
  • Franchise Law
  • Product Liability Law
  • Professional Malpractice Law
  • Real Estate Law
  • Securities Law

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