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Lawrence E. Thacker listen


Lawrence* will work all night when he has to. It’s that dedication that has led him to be recognized nationally as one of Canada's leading trial and appellate counsel. Larry has particular expertise in international commercial arbitration. He also maintains a successful complex and cross-border litigation practice. Larry advocates§ for learning outside of the courtroom, teaching international law at the University of Toronto, and trial advocacy at Osgoode Hall Law School and The Advocates' Society, promoting hard work as one of the keys to success. Known for his work ethic and knowledge across many sectors, Larry is a tireless advocate and dedicated teacher. .



Lawrence E. Thacker

is a partner at Lenczner Slaght.

"Larry provide[s] great, timely advice on strategy and he consider[s] legal and practical issues." — Chambers Canada

One of Canada's leading trial and appellate lawyers, Lawrence has broad experience in mergers and acquisitions, shareholder disputes, complex class actions, infrastructure disputes, procurement matters, securities issues, tax litigation, commercial arbitrations and insolvency restructuring. He has served as lead counsel in several complex international commercial arbitration matters involving large energy infrastructure and power generation projects. He appears regularly at all levels of the Canadian courts, including the Supreme Court of Canada.

Lawrence is also deeply involved in legal education. For a decade he was an adjunct professor in the Political Science Department at the University of Toronto, where he taught international law. Since 1998 he has been an adjunct professor at Osgoode Hall Law School, where he teaches trial advocacy and serves as a team leader and instructor in the school's Intensive Trial Advocacy Workshop. He also teaches courses in trial advocacy skills for The Advocates' Society.

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  • University of Toronto - Adjunct Lecturer of International Law (1999-2009)

  • Commercial Bar Association (comBAR) - Honourary Member

  • The Advocates' Society - Member-at-Large of the Arbitration and Mediation Practice Group

  • Canadian Bar Association

  • Osgoode Hall Law School - Instructor and Former Adjunct Faculty

  • University of Toronto (Faculty of Law) - Instructor and Former Law Faculty

  • Ontario Bar Association

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  • Benchmark Canada (2012-2024)

    Litigation Star – Arbitration, Class Action, Commercial, Insolvency, Securities, Tax

  • Best Lawyers in Canada (2019-2024)

    Alternative Dispute Resolution, Class Action Litigation, Corporate & Commercial Litigation

  • Canadian Legal Lexpert® Directory (2011-2019, 2021-2024)

    Commercial Arbitration, Litigation - Corporate Commercial; Class Actions - Up and Coming (2016), 25 Cross-Border Litigators to Watch (2006)

  • Chambers Canada (2020-2024)

    Dispute Resolution: Arbitration (Nationwide – Canada)

  • Chambers Global (2024)

    Dispute Resolution: Arbitration (Canada)

  • Lexpert Guide to the Leading US/Canada Cross-border Litigation Lawyers in Canada (2014-2017)

    Corporate Commercial Litigation

  • Lexpert Special Edition: Canada's Leading Energy Lawyers (2021)

  • Lexpert Special Edition: Canada's Leading Infrastructure Lawyers (2021)

  • Lexpert Special Edition: Canada's Leading Litigation Lawyers (2015-2017, 2019, 2021, 2023)

  • The Lexpert®/American Lawyer Guide to the Leading 500 Lawyers in Canada

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