John Mather is an associate at DMG Advocates. He is an experienced commercial litigator who has appeared in a variety of domestic and foreign proceedings.

Prior to joining DMG 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.

In addition to regularly appearing before the Ontario Superior Court and Court of Appeal, John has acted in several domestic and international arbitration proceedings, including in New York and Riyadh, Saudi Arabia. He also has experience in injunction and urgent proceedings.

Among other clients, John has recently acted as counsel to leading automobile manufacturers, telecommunications providers, newspaper publishers, oil and petrochemical producers, steel manufacturers, professional services firms and restaurant franchisors, as well as government agencies and non-profit organizations.

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