John Adair Campion

John has been a trusted advisor for more than 45 years, with a practice spanning public and private corporate matters, family enterprises, regulation, and government. His work has included advocacy before courts and tribunals, as well as arbitration, mediation, and strategic dispute resolution. John has been called to the bar in multiple Canadian jurisdictions and has represented clients across Canada and internationally, including in England, Europe, Asia, and the United States. Over the course of his career, he has acted as counsel in more than 300 reported trials, hearings, appeals, and judicial reviews, and has served as an arbitrator in numerous commercial arbitrations.

In addition to his litigation and advisory work, John has played a significant leadership role within the legal profession and public life. 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 Canadian Broadcasting Corporation, and counsel to two Prime Ministers. His career has been marked by service to a broad range of clients and institutions, from heads of state to community organizations and individuals.

John is nationally and internationally recognized as one of Canada’s leading senior trial, appellate, and arbitration counsel, with acknowledgements from Chambers, Best Lawyers, Lexpert, International Who’s Who of Business Lawyers, and Martindale-Hubbell. He has also served as an adjunct professor of law at the University of Toronto and Osgoode Hall Law School and is the author of Professional Liability in Canada. John continues to write and speak extensively in Canada and abroad, contributing to the ongoing development of the law and the profession.