Expertise
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Practice Areas:
Bar Admissions:
Education:
- University of Toronto (2009) LLM
- University of Toronto (2003) LLB (Honours Standing - 3rd Year)
- University of Toronto (1999) MA (English Literature)
- McGill University (1998) BA (Honours - English Literature)
Details
- Bio
- Cases
- Associations
- Blog Posts
- News & Media
- Publications & Presentations
- Recognition
Jaan Lilles
is a partner at Lenczner Slaght and the head of the firm’s Professional Liability practice group.
Jaan's practice embraces a diverse range of litigation: professional liability, medical malpractice, commercial disputes, franchising matters, defence of class actions, employment and administrative law. He has appeared before all levels of court in Ontario, including as lead counsel in the Court of Appeal for Ontario, Divisional Court and the Ontario Superior Court of Justice and he has appeared in the Supreme Court of Canada.
Jaan regularly represents clients before administrative tribunals both as a prosecutor and as defence counsel. He has handled professional discipline matters before the the Law Society Tribunal and several Discipline Committees of various regulated health colleges. He has frequently participated in judicial review applications and appeals from administrative tribunals.
A keen interest in the legal theory of privacy led Jaan to pursue a Master's of Law degree at the University of Toronto, where his graduate thesis was titled "The Common Law Right to Privacy." Jaan is a regular speaker at continuing legal education events and taught for three years as an adjunct professor at the Faculty of Law, Western University.
Jaan has been recognized as a leading lawyer by various organizations including Lexpert, Best Lawyers, and Benchmark Canada.
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Law Society of Ontario v Sorrenti
Counsel to the Law Society of Ontario in an application to have a trustee appointed over a Lawyer’s mortgage administration practice.
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Counsel to the College of Traditional Chinese Medicine Practitioners and Acupuncturists of Ontario in an application and subsequent appeal against respondent organizations and individuals for declarations that the respondents breached the Regulated Health Professions Act. Interim injunctions obtained against the respondents.
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Commissioner of Competition v Rogers Communications Inc
Counsel to the Commissioner of Competition in proceedings against Rogers Communications Inc. and Chatr Wireless Inc. relating to misleading advertising under the Deceptive Marketing Practices provisions of the Competition Act. The application involved successful defence to a constitutional challenge to certain provisions of the Competition Act brought by the respondents.
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Counsel to Danier Leather Inc. in a shareholder class action asserting a statutory cause of action for prospectus misrepresentation pursuant to the Ontario Securities Act. Judgment for the plaintiffs at trial successfully overturned on appeal to the Ontario Court of Appeal and upheld by the Supreme Court of Canada.
Read Lexpert's Significant Matters summary.
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Oshkosh Defense Canada Inc v Department of Public Works and Government Services
Counsel to the Government of Canada in connection with proceedings relating to the procurement process and bid evaluation relating to a contract for the Canadian Forces for the acquisition of light armoured patrol vehicles and related systems.
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Law Society of Upper Canada v Groia
Counsel to the Law Society of Upper Canada in the prosecution of a lawyer for professional misconduct. A three member panel of the Divisional Court affirmed the decision of an Appeal Panel of the Law Society of Upper Canada that found the lawyer had committed acts of professional misconduct. The Divisional Court also confirmed his penalty of a one month suspension and its $200,000 costs award in favour of the law society.
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Counsel on appeal for the defendant physician in a proceeding alleging negligence in the treatment of a fractured wrist. The Court of Appeal's decision provided important guidance on the role of counsel in the preparation of expert reports and the limits on the production at trial of information from an expert witness's file.
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Law Society of Upper Canada v Opara
Counsel to the Law Society of Upper Canada in a successful appeal of a decision concerning unprofessional conduct by a barrister.
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Law Society of Upper Canada v DeMerchant
Counsel to the Law Society of Upper Canada in successfully defending a motion for production of prosecution documents on the basis of a claim of abuse of process.
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College of Massage Therapists of Ontario v Stefanov
Counsel to the College of Massage Therapists of Ontario in a prosecution of a member for professional misconduct under the Regulated Health Professions Act and the subsequent appeal to the Divisional Court.
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Ontario Bar Association
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The Advocates' Society
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Canadian Bar Association
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University of Western Ontario, Faculty of Law - Past Adjunct Professor (2014-2016)
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Entire agreement clauses: usually, but not always, the entire story
Entire agreement clauses are often used to insulate contracting parties from disputes over pre-contractual representations. The recent decision of Curtis Chandler v Karl Hollett demonstrates how bare allegations of pre-contractual misrepresentation will rarely win out over such clauses.
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Participant Experts: who are they, and what can they say?
Expert witnesses have an obligation to be independent and impartial, but not all expert witnesses are created equal.
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Québec Court of Appeal Affirms Duty to Protect and Enhance Brand
The Quebec Court of Appeal affirmed the trial decision in Dunkin Brands Canada Ltd v. Bertico Inc. establishing a duty on franchisor Dunkin Brands to take reasonable steps to protect and enhance the brand in the face of competition. The effect of the decision will have a lasting and potentially far reaching impact on the duties of parties to franchise agreements.
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Nova Scotia Barristers Society without jurisdiction to refuse Trinity Western University grads
The Nova Scotia Supreme Court ruled late in January that the Nova Scotia Barristers Society ("NSBS") must accredit law degrees granted by Trinity Western University ("TWU") in Langley, British Columbia.
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Best Lawyers in Canada Recognizes Lenczner Slaght with 100 Rankings
In the latest edition of Best Lawyers in Canada, 28 Lenczner Slaght lawyers earned a total of 100 rankings, up from 86 in 2019.
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The 2019 Lexpert Directory Recognizes Lenczner Slaght with 89 Rankings
An increasing number of our expert litigators are recognized by their peers as the foremost practitioners in their fields.
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Benchmark Canada Highlights Lenczner Slaght’s Litigation Excellence
Benchmark Canada 2019 not only recognizes Canada’s leading litigation firm with the top tier ranking of “Highly Recommended in Ontario”, 17 Lenczner Slaght litigators are also ranked for their expertise.
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Lenczner Slaght Litigators Ranked in Best Lawyers in Canada
Canada’s leading litigation firm is proud to announce that 25 of the firm’s 58 lawyers have been recognized in the Best Lawyers in Canada 2019 publication across multiple categories.
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Lexpert Recognizes Lenczner Slaght’s Professional Excellence
An increasing number of the firm’s lawyers have been ranked by their peers as leading practitioners in their field.
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Lenczner Slaght Receives Top Tier Ranking in Benchmark Litigation
19 Lenczner Slaght leading litigators are ranked in Benchmark Litigation's 2018 directory, including 7 new additions since last year. Three of the firm's litigation stars are also recognized as a Top 50 Trial Lawyer in Canada.
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Lenczner Slaght Ranked Among the Best
Almost half of the leading litigation firm’s lawyers are recognized in the Best Lawyers in Canada.
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Lenczner Slaght Shines in 2017 Lexpert Rankings
Lenczner Slaght’s litigators continue to be recognized by their peers as leading practitioners in their fields according to the 2017 Canadian Legal Lexpert Directory.
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Ontario Court of Appeal Dismisses Appeal in Groia v. Law Society of Upper Canada
Tom Curry, Jaan Lilles, and Andrew Porter of Lenczner Slaght acted as counsel to the Law Society of Upper Canada before the Court of Appeal for Ontario concerning the finding of professional misconduct and one month suspension imposed by the Law Society Tribunal’s Appeal Division following a lengthy discipline hearing into the lawyer’s unprofessional conduct in court.
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Three Lenczner Slaght cases featured in Lexpert's Top 10 Business Decisions of 2015
Canada's leading litigation practice acted as counsel on the top case in Lexpert's annual ranking
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Prosecuting and Defending Professional Discipline Cases 2020
Jaan Lilles will be sharing his expertise at OsgoodePD's webcast program Prosecuting and Defending Professional Discipline Cases 2020. He will be presenting on the panel Assessing Duties and Powers.
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Prosecuting and Defending Professional Discipline Cases
Jaan Lilles presented at OsgoodePD's Prosecuting and Defending Professional Discipline Cases program. He shared his expertise on the panel discussion Assessing Duties and Powers.
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Transparency and Disclosure Before Administrative Tribunals
Jaan Lilles will be presenting at the Advocates' Society's program called “Transparency and Disclosure Before Administrative Tribunals”. The program will provide an update on the obligations, opportunities, and trends in this area.
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38th Annual Intensive Trial Advocacy Workshop
Monique Jilesen, Risa Kirshblum, Jaan Lilles, and Dena Varah taught at Osgoode Professional Development's 38th Annual Intensive Trial Advocacy Workshop on July 9-15, 2017.
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The Osgoode Certificate in Health Law
Jaan Lilles joined a faculty for the Medical Malpractice: Theory and Practice module for The Osgoode Certificate in Health Law program on April 4, 2017... -
12th Annual Update: Personal Injury Law & Practice
Jaan Lilles joined an expert faculty at Osgoode Professional Development's 12th Annual Update: Personal Injury Law & Practice on September 23... -
The tricky timing of post-judgment mitigation
Jaan Lilles article appeared in the July 10, 2015 issue of the Lawyers Weekly. This article touches on post-judgment trust over employment income earned during the notice period in the event of a wrongful dismissal.
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36th Annual Intensive Trial Advocacy Workshop
Peter Osborne, Lawrence Thacker, Risa Kirshblum, Monique Jilesen, Eli Lederman, Matthew Sammon, Rebecca Jones, Jaan Lilles and Dena Varah were among the... -
The Osgoode Certificate in Professional Regulation and Discipline in the Ontario Health Care Sector
Jaan Lilles was a speaker at this Osgoode Professional Development program on Pre-Hearing Procedures & Fitness to Practice Proceedings
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Managing Employment Law Issues in the Digital Age
Matthew Sammon will be co-chairing this Osgoode Professional Development program on April 20, 2015, in which Jaan Lilles and Dena Varah will be...
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Benchmark Canada (2018-2019)
Future Star
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Best Lawyers in Canada (2014-2020)
Health Care Law, Medical Negligence
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Best Lawyers in Canada (2019)
Toronto "Lawyer of the Year" in Health Care Law
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Canadian Legal Lexpert® Directory (2017-2019)
Litigation - Corporate Commercial, Medical Negligence, Professional Liability