Jacob Klugsberg

Jacob Klugsberg is a litigator at Ross Nasseri. He maintains a general litigation practice with a focus on complex corporate commercial litigation, real estate litigation, appellate litigation, public law, and strategic advice.

Jacob is a skilled negotiator and litigator, known for his ability to achieve favourable outcomes both inside and outside the courtroom. Taking a strategic approach to litigation, Jacob is dedicated to providing his clients with the highest level of service and representation, guiding them through every step of the legal process to obtain the best possible outcomes.

Jacob has extensive experience advising individuals and corporations on a wide variety of matters including contractual disputes, real property disputes, fraud/misrepresentation claims, class actions, shareholder disputes, regulatory and public law matters, professional negligence claims, and parliamentary investigations and inquiries.

Jacob has acted for clients at all levels of Court including the Ontario Superior Court of Justice, the Ontario Court of Appeal, and the Supreme Court of Canada.

Prior to joining Ross Nasseri, Jacob practiced for five years as a litigator at McCarthy Tétrault, a leading national full-service firm, where he acted for a broad range of corporate and individual clients across a variety of industries.

Jacob is an instructor for the Lawyer as Negotiator Course at Osgoode Hall Law School. He is also a contributing author of the fifth edition of Defending Class Actions in Canada and Virtual Advocacy: Litigating from a Distance, published by Lexis Nexis.

Jacob Klugsberg received his JD from Osgoode Hall Law School in 2018, where he was awarded the Ronald J. Rolls '58 Q.C. Prize for Civil Procedure. Jacob also completed an exchange program at the University of Amsterdam where he studied International Law and Arbitration. During law school, Jacob acted as Osgoode Student Ambassador, Vice-President of the Jewish Law Student Association, a caseworker with the Community Legal Aid Services Programme, and an active member of the competitive mooting program. Jacob represented Osgoode on the Price Media Law Moot team where he advanced to the International Rounds in Oxford, England.

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. Jacob 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)