Lax O'Sullivan Lisus Gottlieb

Practice areas

Civil Litigation & Dispute Resolution Class Actions Bankruptcy & Insolvency Insurance Law Wills, Estates & Trusts Administrative & Regulatory Law Business & Corporate Law Indigenous Law

Milestones & recognition

• Founded in 1997 by Clifford Lax, Terrence O'Sullivan and Eleanore Cronk, all previously at large national firms.
• Charles Scott became a partner in 2001, the year Cronk was appointed to the Ontario Court of Appeal.
• Jonathan Lisus joined the partnership in 2010 and Matthew Gottlieb in 2011, and the firm took its current four name form.
• Chambers Canada has ranked the firm Band 1 in Litigation: General Commercial in Ontario for five consecutive years, and Band 1 nationally in Insurance: Dispute Resolution, Restructuring and Insolvency, and Litigation: General Commercial.
• The Legal 500 Canada has ranked the firm Tier 1 in Dispute Resolution: Ontario for seven years, and also in Insurance and Restructuring and Insolvency.
• Benchmark Litigation Canada has named the firm Ontario Firm of the Year in 2019, 2020, 2022 and 2026, and lists 12 of its lawyers as Litigation Stars in Dispute Resolution.
• Best Lawyers in Canada has named 13 of the firm's lawyers to its Best Lawyers and Ones to Watch lists; Jonathan Lisus has been recognized as Lawyer of the Year in Professional Malpractice Law.
• The firm reached a proposed settlement in a national class action against Aviva and obtained a Mareva order freezing assets up to $20 million in a family law dispute.

In the community

• The firm has served for five years as a Gold Sponsor of Pro Bono Ontario, supporting its work to provide access to justice.
• Lawyers act pro bono for the Canadian Civil Liberties Association, including matters that have reached the Supreme Court of Canada.
• The firm supports Young Women in Law, a not for profit that provides support to young women lawyers.
• Lawyers at the firm sit on the Board of Governors of Friends of Simon Wiesenthal Centre, and volunteer with the Divisional Court Amicus program and the Law Help Ontario Duty Counsel project.
• The firm contributes to the Canadian Civil Liberties Education Trust, which works in courtrooms, classrooms and Parliament to advance and protect civil liberties in Canada.
• Lawyers take part in the Chief Justice of Ontario's Advisory Committee on Professionalism, the Commercial List Users' Committee, and the Ontario Bar Association.

Good to know

Wheelchair accessible

Lawyers 36

This firm’s lawyers at a glance

Called to the bar

1992–2026 · median 5 years in practice 34 of 36 lawyers

Law schools

Osgoode Hall Law School (10), University of Toronto (7), University of Ottawa (4), Dalhousie University (2), University of Calgary Faculty of Law (2), University of New Brunswick (2) and 7 more 34 of 36 lawyers

Languages on the roster

French

Who handles what

• Civil Litigation & Dispute Resolution
  Alexander Mulligan, Andrea Galizia, Andrew Gallant, Andrew Winton, Anne Posno, Annecy Pang, Brad Vermeersch, Crawford Smith, Danielle Glatt, Dantae Gagnier, David Endemann, Frank Gillies, Heather Taskey, Jaylene Olson, Jenna D'Aurizio, Joanna MacDonald, John Carlo Mastrangelo, Jonathan Lisus, Madison Bell, Maggie Washington, Mahek Punjabi, Matthew Gottlieb, Michael Currie, Nadia Campion, Nicole Kelly, Paul Fruitman, Paul Michell, Philip Underwood, Rahool Agarwal, Rebecca Waxman, Tyler Morrison, Vivien Milat, Zain Naqi
• Class Actions
  Alexander Mulligan, Brad Vermeersch, Crawford Smith, Danielle Glatt, Dantae Gagnier, David Endemann, Jenna D'Aurizio, Michael Currie, Nadia Campion, Nicole Kelly, Rahool Agarwal, Tyler Morrison
• Bankruptcy & Insolvency
  Andrew Winton, Danielle Glatt, Frank Gillies, Matthew Gottlieb, Philip Underwood
• Administrative & Regulatory Law
  Andrea Galizia, John Carlo Mastrangelo, Jonathan Lisus, Zain Naqi
• Insurance Law
  Dennis Ong, Hovsep Afarian, Joanna MacDonald, Nigel Olesen
• Wills, Estates & Trusts
  Anne Posno, Mahek Punjabi, Nadia Campion, Tyler Morrison
• Indigenous Law
  Rahool Agarwal, Zain Naqi
• Construction Law
  Paul Fruitman
• Real Estate Law
  Andrew Winton