John Mather is an associate at DMG Advocates. He is an experienced advocate who regularly appears before the Ontario Superior Court and Court of Appeal. John has also acted in several domestic and international arbitrations, including in New York and Riyadh, Saudi Arabia. He is currently Associate Inquiry Counsel at the Collingwood Judicial Inquiry.

Among other clients, John acts as counsel for leading automobile manufacturers, telecommunications providers, newspaper publishers, oil and petrochemical producers, steel manufacturers, professional service firms and restaurant franchisors, as well as government agencies and non-profit organizations.

Prior to joining DMG Advocates in 2018, John spent five years as an associate lawyer at a leading national firm, where he maintained a broad litigation practice that included product liability, commercial leasing, defamation, telecommunications, procurement (public and private), infrastructure, environmental, property and jurisdictional disputes.

John earned his law degree from Western University, where he graduated with Distinction. Prior to law, John worked as a journalist in Canada and the United Arab Emirates.

Bar Admission

  • Ontario (2013)


  • Juris Doctor (with Distinction), Western University (2012)
  • Bachelor of Journalism (Honours), Ryerson University (2007)
  • The Advocates’ Society
  • Ontario Bar Association
  • Toronto Lawyers Association