John A. Campion

John A. Campion


John A. Campion
Contact Information

John A. Campion


T 416.865.6697

F 416.865.6636



Advanced Mediation – Harvard, 2015
FCIArb., 2013
University of Toronto – JD, 1972
University of Western Ontario – BA, 1967
Bar Admission

Ontario, 1974
Northwest Territories, 1974
About Gardiner Roberts LLP

For over 100 years, Gardiner Roberts has combined the benefits of a full-service law firm with the dexterity of a mid-sized one. Our focused, cross-disciplinary, one-team approach and commitment to understand your business joins our relevant expertise, immediacy and dedication to providing client-centric, hands-on service. 100% Canadian and fully independent, we offer a level of overall efficiency and cost-effectiveness that larger firms can't touch. Resisting "cookie-cutter" law, Gardiner Roberts has built its name - one rewarding client relationship at a time.

Executive Summary

John has been a force within the Canadian legal community throughout his career. He has been involved in many of the cases that have defined the interaction between Canadian business and law for four decades, from gold mines to boardrooms, from oil fields to isotopes. He has served as an Emeritus Bencher and Bencher of the Law Society of Upper Canada, President of the Federation of Law Societies of Canada, President of the Empire Club of Canada, chair of the Audit Committee of the CBC, counsel to two Prime Ministers and much more, serving everyone from heads of state to underprivileged children during a storied career.

John Campion is nationally and internationally recognized (Chambers, Best Lawyers, Lexpert, International Who’s Who of Business Lawyers, Martindale-Hubbell) as one of Canada’s leading senior trial, appeal and arbitration counsel. He has been an elected Bencher of the Law Society of Upper Canada since 2000 and was President of the Federation of Law Societies of Canada, representing Canada’s 100,000 lawyers nationally and internationally. He has been active in his community: President of The Empire Club of Canada, counsel to the Director of the Canadian Broadcasting Corporation and an adjunct professor of law, Toronto and Osgoode. He is an author of Professional Liability in Canada and publishes and lectures broadly throughout Canada and internationally.


Representative Work
Articles and Presentations
  • Ontario Court of Appeal Loosens Restrictions on Securities Class Actions (Timely Disclosure – February 5, 2014
  • Bullen & Leake & Jacob’s Canadian Precedent of Pleadings, 2nd Edition (Class Actions) – October 2013
  • The Constitutionality of Administrative Monetary Penalties Under the Competition Act: Is Rowan a Full Answer? (Competition Policy International) – September 2012
  • The Marker, Canadian Bar Association’s Criminal Matters Committee of the CBA National Law (Competition Section) – September 2012
  • Bullen & Leake & Jacob’s Canadian Precedents of Pleadings, Carswell (Class Actions) – 2010

  • Cross-Border Litigation Forum, Cambridge, Ontario (Securities Class Actions) – 
    March 1-3, 2010
  • The Canadian Institute’s 10th Annual National Forum, Toronto, Ontario (Class Actions Litigation) – September 23-24, 2009
  • Antitrust/Competition & Marketing Law Group Seminar, Toronto, Ontario (Competition Law) – November 19, 2008
  • 8th Annual National Forum on Class Actions Litigation – September 17-18, 2007
  • 8th Annual National Forum on Class Actions Litigation, The Canadian Institute, Toronto, Ontario – September 17-18, 2007
  • Recent ‘Must Know’ Developments in Canadian – November 17, 2006
  • Antitrust/Competition & Marketing Law Group Seminar, Toronto, Ontario (Competition Law) – November 17, 2006
  • Insight Information: Securities Law Forum, Toronto, Ontario – June 7-8, 2006
My Blog
Board Memberships
  • Senior Fellow, Litigation Counsel of America
  • Elected Bencher (Governor), Law Society of Upper Canada (2000-2015)
  • Past President, Federation of Law Societies of Canada (2009-2010)
  • Executive, Council Member, Federation of Law Societies of Canada (2007-2011)
  • Member, Canadian Bar Association
  • Member, Ontario Bar Association
  • Member, The Advocates’ Society
  • Member, International Bar Association
  • Member, Canadian Civil Liberties Association
  • North American Committee of The Commercial Bar Association (Combar)
  • Trustee, American Bar Association Foundation
  • Fellow, Chartered Institute of Arbitrators, 2013


  • Who’s Who Legal: Canada 2016 for Commercial Litigation
  • The 2015 Lexpert/American Lawyer’s Guide to the Leading 500 Lawyers in Canada for Corporate Commercial Litigation
  • Lexpert 2014 and 2016 Guide to the Leading US-Canada Cross-Border Litigation Lawyers for Class Action and Corporate Commercial
  • Best Lawyers in Canada 2015-2019 for Administrative and Public Law
  • Best Lawyers in Canada 2012-2015 for Director and Officer Liability  
  • Canadian Legal Lexpert Directory 2013-2016 for Class Actions, Litigation - Corporate Commercial, Litigation - Directors’ & Officers’ Liability
  • Canadian Legal Lexpert Directory 2013-2015 for Litigation - Securities
  • Canadian Legal Lexpert Directory 2011 for Litigation - Class Actions, Commercial Insurance, Corporate/Commercial, Director & Officer Liability, Securities, and Professional Liability
  • Chambers Global Guide 2011-2014 for Dispute Resolution in Ontario
  • The 2011 Lexpert/American Lawyer Guide to the Leading 500 Lawyers in Canada for Litigation & Dispute Resolution
  • Practical Law Company 2009 for Dispute Resolution (Canada: Ontario)
  • Certified by the Law Society of Upper Canada as a specialist in civil litigation
  • Arbour Award for outstanding contribution to the University of Toronto
  • Profiled as one of “Canada’s Top 25 Corporate Litigators,” Lexpert Magazine, July/August 2002 - based on combined ratings of corporate commercial, class action, securities and competition litigation and a survey of 3,224 practitioners
  • Lexpert 1997-2006 - rated in the corporate commercial litigation, securities litigation and class actions categories
  • Lexpert 1999-2006 - rated in the corporate commercial litigation, securities litigation and class actions categories
  • Martindale-Hubbell “AV” rating
  • Chambers Global 2002-2006 for Commercial Litigation
  • Who’s Who Legal 2002-2006 for Commercial Litigation
  • Global Counsel 2002-2006 for Commercial Litigation
  • Euromoney, Guide to the World’s Leading Litigation Lawyers and Experts in Commercial Arbitration 2002-2007


Professional Involvement
  • Director and Chair, Audit Committee, Canadian Broadcasting Corporation (1995-2001) 
  • Commissioner, Commission on Election Finances (1989-1999) 
  • President, The Empire Club of Canada (weekly live televised and broadcast speaking platform); 49 speakers in 35 weeks to a live audience of 14,000 people; broadcast across Canada - including four heads of state, chief justice, six cabinet ministers, three premiers, authors, artists, bishops, ambassadors, former vice-president and Nobel laureate
  • Counsel to National Political Campaign (1993, 1997, 2000, 2004, 2006)
  • Director, Canadian Council of Christians and Jews
  • Trustee, Moorelands Camp for Underprivileged Children
  • Director, Downtown Churchworkers Association
  • Coach - Mooredale Soccer
  • The Dickson Circle – pro bono work for persons with disabilities
  • Law Society of Ontario
  • Ontario Bar Association