Duncan Ault

Duncan Ault



Within his practice, Duncan focuses on civil litigation in a wide range of areas. He advises clients in a variety of corporate commercial litigation matters, including:

  • contractual disputes
  • securities litigation
  • shareholder disputes
  • class actions
  • commercial arbitrations
  • directors’ and officers’ liability

He has appeared before all levels of court in Ontario, the Québec Court of Appeal and the Supreme Court of Canada.


Prior to joining BLG, Duncan practised litigation in the Toronto office of a national law firm for five years. During his articles, Duncan was seconded to the Enforcement Branch of the Ontario Securities Commission.


  • Commission Counsel in the Elliot Lake Commission of Inquiry.
  • Counsel before the Ontario Court of Appeal and the Ontario Divisional Court for the Law Society of Upper Canada in Trinity Western University v. The Law Society of Upper Canada.
  • Counsel before the Federal Court of Appeal for Canadian National Railway Company against the Canadian Transportation Agency in two appeals challenging the Agency's revenue cap determinations for transportation of grain.
  • Counsel before the Ontario Superior Court for Canadian National Railway Company in a contractual dispute with the City of Thunder Bay.
  • Represented an international media company in a complex commercial arbitration involving a wide range of issues, including a dispute over certain post-closing working capital adjustments.
  • Represented a Canadian bank in pre-certification, certification and settlement stages of a large class action involving historic foreign exchange transactions on credit cards.
  • Represented Canwest Global Communications Corp. in its restructuring under CCAA proceedings.

Beyond our Walls

Professional Involvement

  • Member, Canadian Bar Association
  • Member, Ontario Bar Association
  • Member, The Advocates’ Society
  • Member, County of Carleton Law Association

Community Involvement

  • Volunteer, Pro Bono Law Ontario
  • Volunteer, LAWS Program
  • Volunteer Board Member, Friends of Humberside Collegiate Institute

Bar Admission & Education

  • Ontario, 2007
  • LLB, Queen's University, 2006