Expertise
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Practice Areas:
- Bar Admissions:
- Education:
- Osgoode Hall Law School (2017) JD
- Queen’s University (2004) BA (Honours - Drama and Classical Studies)
Details
- Bio
- Cases
- Associations
- Blog Posts
- News & Media
- Recognition
Jonathan D. Langley
is an associate at Lenczner Slaght.
Jonathan maintains a broad civil litigation practice. He routinely acts for individuals and corporations in complex commercial matters and regularly defends the interests of physicians in medical negligence actions and regulatory proceedings. He has trial and appellate experience in the Ontario Superior Court, Divisional Court, and the Court of Appeal for Ontario. He also appears regularly before administrative tribunals.
Jonathan graduated from Osgoode Hall Law School, where he worked as a research assistant, a Dean’s Fellow for Constitutional and Public Law, and the Innocence Project researching complex criminal, constitutional, and administrative law matters. He took part in the Osgoode Hall Test-Case Litigation Project where he assisted on a constitutional challenge to police use of fatal force. He was an Associate Editor of the Osgoode Hall Law Journal and competed in the Cassels Brock Cup Criminal Law Moot and the Lenczner Slaght/CBA Gale Cup. He was awarded the Criminal Procedure Prize and the Faisal Mirza Criminal Law Writing Prize.
Prior to attending law school, Jonathan studied theatre and classical studies at Queen’s University where he was awarded the Edythe Zacks Millman Prize in the Performing Arts.
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Liberty Market Building Inc v WeWork Canada LP ULC et al
Counsel to a Canadian commercial landlord in an action for breach of contract arising from the default by WeWork on certain commercial lease agreements and in respect of concurrent bankruptcy proceedings in the United States and Canada.
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Counsel to financial solutions company responding to injunction brought by telecommunications company for confidential data.
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Mel Pearl Construction Limited et al v Cubert Inc
Counsel to a commercial landlord in an action for breach of contract arising from the default of a commercial lease agreement. Successful in obtaining a $2 million default judgment.
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XL Insurance Company SE et al v ACE INA Insurance Company of Canada
Counsel to a major casualty insurer in an insurance action claiming coverage and defence costs arising from various environmental professional proceedings.
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Various DCR Strategies Inc Matters
Counsel to the Plaintiff DCR Strategies Inc. in a number of matters, seeking damages and injunctive relief relating to disclosure and use of confidential information.
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Famous Bakers Inc v Liberty Market Building Inc
Counsel to the commercial landlord in an action arising from the seizure of restaurant equipment following the default of a commercial lease agreement. Successful in having multiple identical actions dismissed as an abuse of process.
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Musllam v Hamilton General Hospital et al
Counsel to the Defendant Physician in successfully resisting proposed amendments to the Statement of Claim after the expiry of the limitations period.
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Industrial Alliance Securities Inc v Kunicyn
Counsel to an investment advisor in an employment dispute arising from a regulatory investigation.
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2730453 Ontario Inc v 2380673 Ontario Inc
Counsel to the successful land developer at trial seeking specific performance of an agreement for the purchase of land for commercial development. Successfully obtained a Certificate of Pending Litigation pending the trial of the action.
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Counsel to the successful respondent in an arbitration about the contractual right to recover interest and other expenses from condominium corporations in relation to the construction of a community center in a private residential community.
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The Advocates' Society
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Canadian Bar Association
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Ontario Bar Association
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Commercial Considerations as Ontario Reopens: Key Takeaways from CLUC Education Day 2021
As vaccine rollouts quicken and Ontario looks forward to a loosening of COVID-19 restrictions, the Ontario Bar Association and the Commercial List Users’ Committee (CLUC) convened its annual Education Day on June 2, 2021.
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Private Parts Less Private During Police Searches
A person’s reasonable expectation of privacy in the most intimate parts of their own body may not shield them from a police search if what the police are after is another person’s DNA.
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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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Lenczner Slaght Welcomes Five New Associates
Canada’s leading litigation firm continues to add to its collective experience and knowledge with the addition of five talented associates.
Lenczner Slaght is delighted to welcome Derek Knoke, Graham Henry, Jonathan D. Langley, Sean Lewis, and Zachary Rosen to the firm as our new associates.
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Lenczner Slaght Raises over $17,000 for Covenant House Toronto
On February 7, 2018, our lawyers participated in the Covenant House Guts + Glory Obstacle Challenge and fundraised over $17,000 which will go to providing health care, food, shelter, and clean clothes to at-risk, homeless and trafficked youth.
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Best Lawyers in Canada (2025)
Ones to Watch – Corporate & Commercial Litigation