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William Main is an associate in McCarthy Tétrault’s Litigation Group in Toronto. He maintains a broad litigation practice with a focus on commercial disputes, defamation and privacy law, professional liability, estate litigation, class actions, and securities law. William has appeared before the Ontario Court of Appeal, the Ontario Superior Court of Justice, the Health Professions Appeal and Review Board (HPARB), and the Discipline Committee of the College of Physicians and Surgeons of Ontario. William has also acted as counsel in private commercial arbitration matters.


  • Counsel to the successful financial institution in Jama v. National Bank, 2017 ONSC 1424, which was dismissed by summary judgment;
  • Counsel to the successful respondent physician on an appeal to the HPARB in Applicant v G.B.J., 2017 CanLII 53783 (ON HPARB);
  • Summary judgment dismissal of a proposed class action against the LCBO and several major players in the Ontario beer market (the “Beer Store Class Action”), on for a defendant brewing company in Hughes v. Liquor Control Board of Ontario, 2018 ONSC 1723;
  • Counsel to a technology and consulting company in a multi-million dollar private arbitration;
  • Counsel to a plaintiff federation of credit unions in a breach of contract action;
  • Assisting a municipality with defamation matters.

William received his law degree from the University of Oxford in 2014. William graduated from Oxford with first-class honours and as the recipient of four class prizes, for the top performance in constitutional law, criminal law, jurisprudence and as a senior status student. William obtained his Master of Laws from the University of Toronto in 2015. William also holds an Honours Bachelor of Arts in Philosophy and Economics from Wilfrid Laurier University, during the course of which he was the recipient of the Fred Little Memorial Award for Excellence in Philosophy.

William was called to the Ontario Bar in 2016.