Sarah Firestone

Sarah Firestone

Associate, Litigation

Contact Information

tel: 416.862.4727



Bar Admission

Ontario, 2020


  • University of Toronto, J.D.
  • University of Oxford, M.Sc.
  • McGill University, B.A. (First Class Honours)



Sarah is an associate in our Litigation Group. She maintains a broad civil and commercial litigation practice, with a focus on domestic and international arbitration and securities litigation. She has experience with commercial arbitration and investment treaty arbitration, as well as regulatory investigations and enforcement issues.

Sarah previously worked as a legal trainee in the International Arbitration Practice Group of a major global firm in Paris, was seconded to the Enforcement Branch of the Ontario Securities Commission, and completed a summer clerkship at the Ontario Superior Court of Justice. Sarah has contributed to the Litigation & Dispute Resolution module of Lexis Practice Advisor, including on the topic of international arbitration. Sarah received her J.D. from the University of Toronto where she was President of the Litigation Association, Senior Editor of the Law Review, and completed the Mergers & Acquisitions Litigation Externship. Sarah also obtained her M.Sc. from the University of Oxford in Global Governance and Diplomacy, B.A. (Hons.) from McGill University, and received a scholarship to complete the Certificate in Public International Law at The Hague Academy of International Law.

Sarah joined Osler as a summer student in 2018 and completed her articles with the firm in 2019-2020.

  • The Edward and Emily McWhinney Foundation Scholarship
  • Women’s Law Association of Ontario/Torkin Manes LLP Trailblazer Award for her leadership role in promoting women in business, legal expertise and business acumen, and an entrepreneurial spirit

  • Volunteer Judge, McGill Moot Court Invitational Tournament (2021)
  • Moot Coach (2020-2021), Willem C. Vis International Commercial Arbitration Moot Team at Osgoode Hall Law School
  • Symposium Planning Committee (2020), Young Canadian Arbitration Practitioners (YCAP)

  • Law Society of Ontario
  • Young Canadian Arbitration Practitioners

  • Mediation-Arbitration in Canada (L. Tomasich and S. Firestone), LexisNexis Canada Inc., March 2021.”
  • Anti-Corruption Canada: Trends & Developments (S. Eljarrat, M. Aboud and S. Firestone), Global Practice Guides, 2021
  • Research Assistant to Hon. Allen M. Linden, for the 15th edition of Canadian Tort Law: Cases, Notes & Materials (2018).