Gerald Grenon

Gerald Grenon

Partner, Tax

Contact Information

tel: 403.260.7014



Bar Admission

Alberta, 1995


  • University of Manitoba (LL.B.)
  • University of Manitoba, B.A. (History)



Gerald is a partner in the firm’s taxation practice. His practice encompasses all stages of tax dispute resolution from dealing with CRA audits to litigating in court. Gerald has appeared before the Tax Court of Canada, Federal Court of Appeal, Supreme Court of Canada and Alberta Court of Queen’s Bench, including such well-known cases as Canada Trustco v. The Queen (the first Supreme Court of Canada decision on the General Anti-Avoidance rule in which a taxpayer was successful), Shell Canada v. The Queen (where the Supreme Court of Canada held that: the Crown was not allowed to tax on substance over form; interest deduction allowed; gain on hedge capital) and 3850625 Canada Inc (formerly Fording Coal) v. The Queen (where the Federal Court of Appeal held that refund interest increased the taxpayer’s resource allowance deduction).

Prior to joining Osler, Hoskin & Harcourt LLP, Gerald was a partner with a leading Calgary firm and its affiliated firm, KPMG Canada, practising in the area of tax dispute resolution and litigation. Before commencing his practice as a tax litigator, Gerald served as a Judicial Clerk to the Honourable Barry Strayer of the Federal Court of Appeal.

  • The Canadian Legal Lexpert Directory: Recognized in Litigation - Corporate Tax; Corporate Tax
  • The Lexpert Guide to the Leading US/Canada Cross-border Litigation Lawyers in Canada: Recognized in Litigation - Corporate Tax; Canada corporate tax litigation lawyers
  • Best Lawyers in Canada: Recognized in Tax Law
  • International Tax Review: Recognized in Tax Controversy as a Highly Regarded Lawyer
  • Who's Who Legal: Recognized in Corporate Tax - Controversy; Canada - Corporate Tax

  • Canadian Petroleum Tax Society, Member and Former Director
  • Canadian Tax Foundation, Member
  • Canadian Bar Association, Member

  • Gerald has authored and co-authored numerous articles on income tax matters, and is a frequent speaker, including presentations at the annual conferences of the Canadian Tax Foundation and the Canadian Petroleum Tax Society.
  • Gerald has also served as a Lecturer to the CICA’s Corporate reorganizations course respecting the topics of the General Anti-Avoidance rule and interest deductibility.

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