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Andrew Moeser listen

About

Andrew* is a versatile litigator. His practice is primarily focused on intellectual property litigation, but he is equally comfortable handling a judicial review or a contaminated property dispute. When it comes to complex issues, he gets it§ whether it’s a scientific study or a legal strategy. Possessing a master’s degree in biology and having worked as a coordinator of a phase III clinical trial, Andrew is that combination of litigator and scientist that brings a deep understanding to the issues facing our clients. He makes the situation right‡ by knowing the client’s business and drawing on his diverse litigation experience to provide the fitting solution to any problem. .

Expertise

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Andrew Moeser (he/him)

is a partner at Lenczner Slaght.

"Andrew has a brilliant legal mind. He is a strategic thinker and is able to formulate creative and practical solutions to overcome the toughest challenges." — Chambers Canada

Andrew is a leading intellectual property litigator, trusted by clients to take on their most complex and high-value disputes. In patent matters, he acts for clients across the pharmaceutical and biologics, information technology, and oil and gas sectors. In trademark, copyright, and trade secret disputes, he has represented clients in industries ranging from software and gaming to film and publishing to beauty products.

A versatile litigator, he also has significant experience in commercial litigation relating to environmental contamination, and in judicial reviews in regulated industries such as pharmaceuticals, mining, and renewable energy.

Andrew has represented clients before all levels of court in Ontario, the Federal Court, the Federal Court of Appeal, and the Alberta Court of Appeal. He has acted pro hac vice in proceedings in the United States and has extensive experience working within international teams on large cross-border disputes.

Andrew is also an Adjunct Professor at the University of Toronto Faculty of Law, where he supervises a legal clinic that assists the Structural Genomics Consortium, a not-for-profit public-private partnership that engages in precompetitive basic science research to facilitate and enable the discovery of new medicines.

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  • University of Toronto Faculty of Law - Adjunct Professor, Clinical Legal Education: Externship - Structural Genomics Consortium (2016-present)

  • Intellectual Property Institute of Canada - Vice Chair of the Conference Committee (2025-2027); Member of the CPD Committee (2021-2023); Member of Conference Committee (2021-2025)

  • The Advocates’ Society

  • Canadian Bar Association

  • Ontario Bar Association

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  • Benchmark Canada (2024)

    Future Star

  • Best Lawyers in Canada (2025-2027)

    Intellectual Property Law

  • Canadian Legal Lexpert® Directory (2025-2026)

    Life Sciences & Health (2025), Intellectual Property, Litigation - Intellectual Property

  • Chambers Canada (2026-2027)

    Intellectual Property: Litigation (Nationwide – Canada)

  • IAM Patent 1000 (2022-2026)

    Patent Litigation: Recommended Individual (Silver)

  • Lexpert Special Edition: Canada's Leading Health Sciences Lawyers (2026)

  • Lexpert Special Edition: Canada's Leading Technology Lawyers (2026)

  • LMG Life Sciences (2025)

    Intellectual Property

  • Managing Intellectual Property: IP STARS (2025-2026)

    Patent Star – Canada

  • The Legal 500 Canada (2022-2026)

    Intellectual Property (Recommended Lawyer), Intellectual Property Litigation (Recommended Lawyer)

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