John A. Campion

John A. Campion

Gardiner Roberts LLP

Recognized since 2006

Toronto, Ontario

Practice Areas

Corporate and Commercial Litigation

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John Campion is a Partner at Gardiner Roberts LLP.

He is ranked by Lexpert among the top 25 civil litigators in Canada, consistently ranked in Lexpert and American Lawyer in civil litigation, class actions, directors and officers liability; in Best Lawyers; in Chambers Global. He is certified by The Law Society of Upper Canada as a Specialist in civil litigation.

He is a four-time elected Bencher of the Law Society of Upper Canada (2000 - 2015) and is Bencher Emeritus.

He is Past President of the Federation of Law Societies of Canada, representing Canada's over 100,000 lawyers from across Canada, nationally and internationally.

He has been practising advocacy (litigation, arbitration and mediation) as a partner for 35 years.

He has appeared in over 300 court, administrative tribunal and arbitration reported decisions and public cases, across Canada and at every level of Court; Federal, Provincial and Supreme Court of Canada. Of those reported cases, 92 leading decisions have been judicially considered 1,642 times by other courts.

In civil litigation, he has been counsel in leading decisions in banking, securities, insurance, pension, competition, human rights, constitutional, criminal, environmental, energy, regulation, mining, construction, copyright, transportation, insolvency, corporate oppression, fraud: at trial and in appeals across Canada.

In class actions, he has successfully avoided certification and settled cases as follows: the $8-billion Bre-X Minerals securities misrepresentation in the secondary mark trading; $100-million insurance case involving the interpretation of legislation affecting 60 P&C companies; consumer protection litigation against UPS in three provinces; mass tort claims arising in three train derailments; product liability for Guidant in pacemakers and defibrillators, drug negligence; labour; systemic abuse - 36 decisions - judicially considered 491 times.

He has been counsel to the Ontario Energy Board for 16 years in 47 hearings, the Financial Services Commission of Ontario, the Commissioner of Competition for Canada in trials, the Federal Department of Justice, the Ontario Automobile Insurance Board and the Pension Commission of Ontario.

He was counsel to the TD Bank for 25 years, to VIA Rail for 20 years, McCain Foods for 15 years and MDS/Nordion for 25 years.

He has been counsel to three public inquiries: at the United Nations in the Oil-for-Food Inquiry chaired by Paul Volcker; in the Energy Inquiry de-regulating Canada's national natural gas industry and in the Gomery Inquiry into political sponsorship scandals.

He was adjunct professor of law at Osgoode Law Schoool and the University of Toronto Law School (1983-1999).

He was counsel to two Prime Ministers of Canada and a political party.

He is a co-author "Professional Liability in Canada" Carswells - Thomson Reuters.

He is a lecturer and speaker across Canada and around the world.

He has been qualified as an expert witness in common law in Canada in the Quebec trial courts, and before the Senate of Canada.

He was a Director and Chair of the Audit Committee of the Canadian Broadcasting Corporation (1995-2001).

He was President of the speaking club - The Empire Club of Canada (39 speakers in 35 weeks)

His practise has taken him across the country and around the world: USA, France, UK, India, China, Turkey, Indonesia, South Africa, UAE, Israel, Italy, Switzerland, Hong Kong, Taipei, Australia, Sweden, Japan, Germany, Holland, Greece, and Spain.

Contact & Links
  • Bay Adelaide Centre, East Tower
    22 Adelaide Street West, Suite 3600
    Toronto, ON M5H 4E3
  • English
Bar Admissions
  • Ontario, 1974
  • Ontario, 1974
  • Law Society of upper canada - Emeritus Bencher
Court Admissions
  • BC,Alta,NWT,Man,Quebec,NS,NB,

Recognized in The Best Lawyers in Canada 2023 for work in:
  • Corporate and Commercial Litigation
Special Focus:
  • Litigation
  • Arbor Award: outstanding voluntary service to the University of Toronto

John Campion,BA,JD (Toronto),FCIArb,Mediation(Harv),CS,Emeritus Bencher
Over 40 years of Complex and multi-party litigation across Canada and internationally- business, corporate, states, family and government: family disputes over corporate control of multi-billion-dollar McCain foods, dispute over class a share control of Canadian Tire, ; class actions: Bre X minerals, salvage insurance, Toronto propane explosion, pan- Canadian consumer protection complaints for UPS, product liability for Boston scientific, securities for SouthGobi, including reinstatement of a public company financial statements, systemic abuse; private law: over 270 reported casesL: banking, energy, pipelines, construction, insurance, securities, railways, mining, competition, political issues, construction of nuclear reactors and supply of nuclear medicine, family business and corporate disputes, shareholder oppression, bankruptcy, closely held corporations and partnership disputes, large public company disputes and three public inquiries: deregulation of the natural gas industry, Gomery Inquiry and United Nations Oil for Food Investigation.

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