Jacob Klugsberg

Jacob Klugsberg is a partner at Ross Nasseri LLP. He maintains a broad litigation practice with a focus on complex corporate-commercial disputes, real estate litigation, shareholder disputes, estate litigation, appellate advocacy, and public law.

Jacob is a strategic advocate and skilled negotiator, recognized for achieving practical, client-focused outcomes both inside and outside the courtroom. He brings a thoughtful, measured approach to litigation and is known for his responsiveness, clear communication, and commitment to delivering exceptional service.

Jacob regularly represents individuals, corporations, and public bodies in high-stakes matters involving contractual disputes, property-related claims, shareholder and partnership litigation, estates disputes, fraud and misrepresentation, regulatory proceedings, and professional negligence. He has also acted in high-profile parliamentary inquiries and public law cases.

He has appeared before all levels of Court, including the Superior Court of Justice, the Divisional Court, the Ontario Court of Appeal, and the Supreme Court of Canada.

Prior to joining Ross Nasseri, Jacob practiced for six years at McCarthy Tétrault LLP, a leading national law firm, where he advised a wide range of clients across industries and sectors.

Jacob teaches negotiation at Osgoode Hall Law School and is a contributing author to Defending Class Actions in Canada (5th ed.) and Virtual Advocacy: Litigating from a Distance (LexisNexis).

He received his JD from Osgoode Hall Law School in 2018, where he received the Ronald J. Rolls '58 Q.C. Prize for Civil Procedure. He also studied International Law and Arbitration on exchange at the University of Amsterdam. Prior to law school, Jacob obtained a Bachelor of Health Sciences (Honours) from McMaster University, where he graduated summa cum laude.

Jacob was called to the Ontario bar in 2019 and is a member of the Law Society of Ontario, the Canadian Bar Association, the Ontario Bar Association, the Toronto Lawyers’ Association, and The Advocates’ Society

Representative Matters

• Representing a public company in an action against its former directors and officers for breaches of fiduciary duties
• Acting for a respondent in a complex multi-million dollar estate dispute
• Defending the Toronto-Dominion Bank in a $5.5 billion action arising from the collapse of Stanford International Bank at trial and on appeal
• Representing a real estate developer in a complex multi-million dollar construction and fraud matter
• Representing commercial landlords in complex lease disputes
• Representing a major telecommunications company in proceedings on the Commercial List
• Defending a Crown Agency in a complex public contractual and tort action
• Bringing a landmark challenge to the constitutionality of prolonged solitary confinement in Canadian prisons as well as the ensuing successful Class Actions
• Defending physicians against allegations of professional negligence
• Advising political parties, corporations, and executives on their legal obligations regarding ethical compliance, conflicts of interest, election financing, political advertisement, and lobbying

Recent Decisions

• Maurice Law Barristers & Solicitors v Sweetgrass First Nation, 2025 SKKB 67: Counsel to a Trustee on an application for specific performance of an irrevocable direction
• Girgis v Mansour, 2024 ONCA 913: Acted for an Appellant on a will interpretation and rectification appeal
• University of Toronto (Governing Council) v. Doe et al., 2024 ONSC 3755: Acted for an intervenor in an interlocutory injunction to end a University encampment
• Ramos v Neves, 2024 ONSC 3019: Successfully obtained an urgent certificate of pending litigation on a disputed property
• Levac v James, 2023 ONCA 73: Acted for a physician in a class action involving an infectious disease outbreak at trial and on appeal
• McDonald v. Toronto-Dominion Bank 2022 ONCA 788: Successfully defended the Toronto-Dominion Bank in a $5.5 billion action arising from the collapse of Stanford International Bank at trial and on appeal
• 20/20 Management Limited v. Concord Adex Inc., 2022 ONSC 3119: Successfully obtained a stay of breach of trust claims under the Construction Lien Act

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)