Expertise
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Practice Areas:
- Bar Admissions:
- Education:
- Osgoode Hall Law School (2010) JD
- University of Toronto (2006) HBSc (High Distinction - Human Biology and Archaeological Science)
Details
- Bio
- Cases
- Associations
- Blog Posts
- News & Media
- Publications & Presentations
- Recognition
Ian MacLeod
is counsel at Lenczner Slaght.
Ian has a general litigation practice, which includes commercial litigation, employment and professional liability and regulation. His commercial practice includes class actions, contractual disputes, and shareholder disputes. Ian has an active professional liability practice, acting for physicians in civil and regulatory proceedings and also prosecuting on behalf of professional regulators, including The Law Society of Upper Canada and the College of Massage Therapists of Ontario. Ian has appeared before all levels of court in Ontario as well as various administrative boards and tribunals.
During the course of his legal studies, Ian represented clients at Ontario courts and participated in law reform initiatives with the Community and Legal Aid Services Programme at Osgoode Hall Law School. He also served as a research assistant to a professor of securities law.
Prior to pursuing his law degree, Ian was active in competitive swimming. He represented Canada at the World University Games and was honoured as the University of Toronto's Male Athlete of the Year.
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Counsel to the successful Defendant Physician in a trial for alleged negligence for a delayed diagnosis of a ureteric injury.
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Ioana Huma et al v Gregory Sue-A-Quan et al
Counsel for physicians in a medical malpractice action. Parties entered into settlement. Plaintiffs resiled from the settlement. Successfully moved to enforce settlement and upheld result on appeal.
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Huma v Mississauga Hospital and Queensway Health Centre (Trillium Health Partners)
Successful in enforcing a settlement agreement against multiple Plaintiffs.
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Cooper v Her Majesty The Queen in Right of Ontario
Counsel for the Provincial Crown in the Court of Appeal, defeating an attempt to extend the time to appeal a decision granting summary judgment below.
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City of Mississauga Judicial Inquiry
Counsel to the Commissioner in the City of Mississauga Judicial Inquiry, an independent Judicial Inquiry tasked with investigating issues in connection with the acquisition by the City of Mississauga of land in the city centre and issues in connection with a shareholders agreement to which the City was a party.
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Best Theratronics Ltd v Canadian Nuclear Laboratories Ltd
Counsel to Best Theratronics on an interlocutory injunction motion relating to a commercial contract dispute.
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International Commercial Arbitration
Counsel to a UK-based energy company in a series of international commercial arbitrations relating to the sale of a nuclear power generation facility.
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KLP v T[…] District School Board
Counsel to the plaintiff in a successful jury trial against a school board in connection with an allegation that a failure by the school board to properly supervise led to a student being sexually assault.
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Schenk v Valeant Pharmaceuticals International Inc
Counsel to Valeant in a breach of contract action in respect of a pharmaceutical product.
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Iskander v BMO Nesbitt Burns Inc
Counsel to the successful appellants, BMO Nesbitt Burns Inc. and BMO Trust Company, on an appeal related to withholding tax payable upon transfer of securities from a Registered Account Savings Plan account.
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Canadian Bar Association
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Pro Bono Law Ontario
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Law Help Ontario
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The Advocates' Society
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Ontario Bar Association
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A contractual provision which entitles a party to an excessive administrative charge on default may be considered an unenforceable penalty clause. Notwithstanding parties’ general freedom to negotiate their own remedies, Courts will find overly onerous damages provisions unenforceable. This was exactly the situation in RCAP Leasing Inc v Martin.
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Lenczner Slaght Litigators Recognized as the Best Lawyers in Canada
In the 2025 edition of Best Lawyers in Canada, Lenczner Slaght is proud to receive 168 total rankings, with 45 of our expert litigators recognized for their expertise across 25 practice areas.
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The 2024 Lexpert Directory Recognizes Lenczner Slaght’s Litigation Excellence
Lenczner Slaght’s litigators continue to be recognized by their peers as the foremost practitioners in their fields.
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Lenczner Slaght Litigators Recognized as Best Lawyers in Canada
In the latest edition of Best Lawyers in Canada, 41 of our expert litigators are recognized for their expertise across 24 practice areas. The following lawyers have also been recognized as “Lawyer of the Year” for receiving the highest overall peer-feedback in their practice areas in Toronto.
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Lenczner Slaght’s Litigation Excellence Recognized in 2023 Lexpert Directory
Following comprehensive peer review surveys and interviews with senior members in the legal profession, the 2023 Canadian Legal Lexpert Directory has recognized 31 of the firm’s expert litigators for their experience, knowledge, and precision, with 108 rankings spanning 17 practice areas.
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Lenczner Slaght Litigators Recognized Among the Best Lawyers in Canada
In the latest edition of Best Lawyers in Canada, 39 of our expert litigators are recognized by their peers for their expertise across 24 practice areas.
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The 2022 Lexpert Directory Recognizes Lenczner Slaght’s Litigation Excellence
31 of our expert litigators are recognized by their peers as the foremost practitioners across 18 fields.
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Lenczner Slaght Litigators Ranked Among Best Lawyers in Canada
In the latest edition of Best Lawyers in Canada, 37 of our expert litigators are recognized for their expertise across 25 practice areas.
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The 2021 Lexpert Directory Recognizes 30 Lenczner Slaght Lawyers
An increasing number of our expert litigators are recognized by their peers as the foremost practitioners in their fields.
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Court of Appeal orders new trial due to judge’s insufficient reasons
Ian MacLeod is mentioned in the article titled "Court of Appeal orders new trial due to judge’s insufficient reasons", which appeared in the November issue of the Canadian Lawyer Magazine.
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Decision on sufficiency of reasons highlights need to be specific in submissions: lawyer
Ian MacLeod is quoted in The Lawyer's Daily article Decision on sufficiency of reasons highlights need to be specific in submissions: lawyer. The article discusses the Ontario Court of Appeal's decision to order a new trial because the trial judge's reasons for his decisions were insufficient to form the basis for a “meaningful” appellate review.
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Volochay v College of Massage Therapists of Ontario
Ian MacLeod presented to research lawyers on a case he argued with Peter Osborne at the Ontario Court of Appeal regarding judicial review of administrative decision-makers.
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Best Lawyers in Canada (2020-2025)
Health Care Law, Medical Negligence
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Canadian Legal Lexpert® Directory (2021-2024)
Medical Negligence, Professional Liability