Sarah Firestone

Sarah Firestone

Associate, Litigation

Contact Information

tel: 416.862.4727



Sarah is an associate in our Litigation group and a member of the Domestic and International Commercial Arbitration, White Collar Defence, International Trade and Investment, and Risk Management and Crisis Response practices. She has experience with commercial and civil litigation matters, domestic and international commercial arbitrations, investor-state arbitrations, trade disputes, anti-corruption compliance, internal and regulatory investigations, and enforcement issues.

Sarah was previously seconded to the Enforcement Branch of the Ontario Securities Commission, worked as a legal trainee in the International Arbitration practice group of a major global firm in Paris, and completed a summer clerkship at the Ontario Superior Court of Justice. Active in the arbitration community, Sarah serves on the Executive Board of Young Canadian Arbitration Practitioners (YCAP) as the Chair - Policy and Advocacy Committee, acts as Arbitration Advisor at LexisNexis Practical Guidance, and coached the Willem C. Vis International Commercial Arbitration Moot Team at Osgoode Hall Law School for several years.

Sarah received her J.D. from the University of Toronto, 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.

  • Prospector Capital Corp.

    Prospector Capital Corp. in its business combination with LeddarTech for US$ 348 million

    • Representing a European subsidiary of a Canadian mining company in an investor-state arbitration in The Hague against a member state of the European Union, alleging discriminatory treatment under the terms of a bilateral investment treaty
    • Conducting internal and regulatory investigations
    • Drafting arbitration, anti-corruption, anti-money laundering, and trade provisions in various agreements
    • Representing an infrastructure company before the Canadian International Trade Tribunal in the expiry review of an anti-dumping injury finding
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  • 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

  • Chair - Policy and Advocacy Committee on Executive Board (2022-), Board of Directors (2021-), Events Committee Member (2020-2022), Young Canadian Arbitration Practitioners (YCAP)
  • Arbitration Advisor at LexisNexis Practical Guidance
  • Moot Coach (2020-2022), Willem C. Vis International Commercial Arbitration Moot Team at Osgoode Hall Law School
  • Volunteer Judge, McGill Moot Court Invitational Tournament (2021)

  • Law Society of Ontario
  • Women’s White Collar Defense Association
  • Young Canadian Arbitration Practitioners

  • Mundo Media: Insolvency single proceeding model vs. international arbitration clause (M. Paterson, M. Angela Rowe, S. Firestone), LexisNexis Canada Inc., September 2022
  • Anti-Corruption Canada: Trends & Developments (S. Eljarrat, M. Aboud and S. Firestone), Global Practice Guides, 2022
  • Sources of Ethical Obligations in International Arbitration, (S. Bjorkquist and S. Firestone), LexisNexis Canada Inc., May 2021
  • 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).