Sarah Bussin

Sarah is a litigator at Ross Nasseri. She is developing a broad civil litigation and regulatory practice with an emphasis on complex commercial matters, securities litigation, and professional liability.

Before joining the firm, Sarah summered and articled at McCarthy Tétrault’s Toronto office. During her time there, Sarah assisted with trials, appeals, motion hearings, and arbitrations, across a range of areas of law including corporate/commercial, medical malpractice, banking and finance, class actions, and defamation.

Sarah received her JD from Queen’s University. While at law school, Sarah was named to the Dean’s Honour List, received course prizes in Evidence and Mental Health Law, as well as the Professor H.R.S. Ryan Scholarship for having the highest standing in Evidence. Sarah discovered her passion for advocacy while mooting. She competed in the Wilson Moot, where her team was awarded the top facta and third place overall. Sarah coached the Wilson Moot team the following year. While at Queen’s, Sarah also volunteered for Pro Bono, the Women and Law club, and served as an academic tutor for first-year law students.

Prior to law school, Sarah received a Bachelor of Arts (with distinction) in Psychology from McGill University, where she was named to the Dean’s List. She also worked for a national bank and the Law Society of Ontario.

Representative Matters

• Acting for a commercial property owner in a claim against professional advisors relating to negligent advice regarding an easement
• Argued a motion to strike arising from an attempted collateral attack outside the Family Court
• Successfully assisted a physician to reinstate her license following a suspension by the regulator
• Acting for developers in civil proceedings arising from real estate transactions

Firm

• Best Law Firms in Canada 2025:
  • Tier 1 Nationally for Corporate and Commercial Litigation
  • Tier 1 in Toronto for Corporate and Commercial Litigation, Administrative and Public Law, Appellate Practice
• Chambers Canada 2025: Highly Regarded firm in Commercial Litigation in Ontario (2024)
• Lexpert :
  • Recognized as a Consistently Recommended firm for Corporate/Commercial Litigation (2024)
  • Repeatedly Recommended firm for Professional Liability by Lexpert (2024)
  • Who’s Who Bullseye for leading firms in Civil Litigation (2024)
  • Who’s Who Bullseye for leading firms in Commercial Litigation (2024)
• Benchmark Litigation :
  • Leading litigation firm in Canada (2021, 2022, 2023, 2024)
  • Highly Recommended Firm (2025)
  • Litigation Boutique Firm of the Year (2025)
• RN LLP recognized in The Globe and Mail’s Canada’s Best Law Firms list for Dispute Resolution (Litigation, Arbitration & Investigations) (2021, 2022, 2023, 2024)