December 1, 2025
Lenczner Slaght Recognized in Legal 500 Canada for Litigation Excellence
As Canada’s leading litigation firm, we are proud to maintain our Tier 1 ranking in Dispute Resolution in Legal 500 Canada.
Based on extensive research, client feedback, and interviews with leading lawyers, Lenczner Slaght is also featured for its expertise in Construction, Insurance, Insurance: Dispute Resolution, Intellectual Property, IP Litigation, Life Sciences, and Restructuring and Insolvency.
Dispute Resolution
Hall of Fame
Leading Partners
Next Generation Partner
Recommended Lawyer
Legal 500 had this to say about our expert litigators:
Lenczner Slaght is a reference in the market for dispute resolution matters in Ontario, representing public and private companies, governments and regulators.
Monique Jilesen leads the team, focusing on
class actions,
injunctions and insolvency matters, with practice co-head,
Eli Lederman, handling franchise disputes, commercial contracts and
securities litigation. Standout members of the team include
Peter Griffin KC, who has represented clients in numerous trials, arbitrations and
appeals, and
Tom Curry is rated for his work on business disputes, judicial reviews and professional liability matters.
Matthew Lerner (real estate disputes and partnership disputes) and
Brian Kolenda (professional negligence and defamation) are other names to note.
Construction
Leading Partner
Next Generation Partner
Recommended Lawyer
Toronto dispute resolution boutique Lenczner Slaght houses a growing contentious construction practice. The group acts for an impressive roster of construction companies, developers, project owners and insurers on the full range of judicial and arbitral proceedings, with a strong record in claims related to large-scale transport projects.
Andrew Parley, who is also a qualified engineer, anchors a team that includes high-profile trial lawyer
Matthew Sammon and newly promoted partner (January 2025),
Aaron Grossman.
Insurance & Insurance: Dispute Resolution
Leading Partner
Next Generation Partner
Recommended Lawyer
Lenczner Slaght centres its Toronto-based insurance practice on representing clients in policy, coverage and defence mandates. The firm’s bench has strong expertise in insurance matters and before all levels of courts. The team has litigated cases among and against insurers involving a wide array of issues, such as trigger of coverage, covered and excluded claims, obligations, allocation of defence and indemnity. The firm is noted for its work in the reinsurance space, class actions, director’s and officer’s liability, environmental property damage claims and professional negligence claims. Practice head
Nina Bombier is an insurance expert who handles complex insurance cases involving coverage issues,
product liability claims and environmental contamination cases.
Mark Veneziano is experienced in insurance and
commercial litigation, while
Aoife Quinn is a civil litigation specialist.
Intellectual Property & Intellectual Property Litigation
Leading Lawyers
Recommended Lawyers
Forming a key pillar of the firm’s dominant dispute resolution offering, Lenczner Slaght’s IP group is distinguished by its formidable track record in patent, trademark and copyright proceedings before all court levels. Acting for a diverse roster of life sciences, media and entertainment, technology and other IP-rich companies, the team routinely represents domestic and international clients in sophisticated multi-jurisdictional litigation. High-profile litigators
Sana Halwani and
Jordana Sanft co-chair the practice…
Andrew Moeser has in-depth knowledge of the pharmaceutical and biologics, information technology, and oil and gas industries, and
Martin Brandsma was promoted to partner in January 2025.
Life Sciences
Recommended Lawyers
Lenczner Slaght is a specialized litigation firm that utilizes its experience in IP litigation to advise on life sciences disputes. The team is adept at handling patent trials, representing clients in proceedings before the Federal Courts, the courts of Ontario and the Supreme Court of Canada. The team also handles cross-border IP litigation involving the US, advising American companies on Canadian laws and regulations. The firm advises domestic and international clients from pharmaceuticals, biotechnology, IT, software, internet and manufacturing sectors.
Sana Halwani leads the team and is an expert in cross-border IP disputes, while co-head
Jordana Sanft focuses on patent impeachment and infringement actions under the Patented Medicine (Notice of Compliance) Regulations.
Insolvency and Restructuring
Recommended Lawyers
Lenczner Slaght are litigation specialists who are well-versed in handling commercial reorganizations for small, medium and large businesses. The firm has experience representing clients in all levels of courts up to the Supreme Court level and acts for creditors, debtors and court-appointed officers.
Monique Jilesen co-leads the team and is a leading litigator who has vast experience counselling creditors and receivers in multi-party restructuring and insolvency proceedings. Co-head of the team,
Matthew Lerner is an expert in commercial litigation and is adept at handling shareholder or partnership disputes alongside insolvency proceedings.
About Legal 500
The Legal 500 rankings are based on a series of criteria that recognize the practice area teams who provide the most cutting edge and innovative advice to corporate counsel. The research is based on feedback from 300,000 clients worldwide, submissions from law firms and interviews with leading private practice lawyers, and a team of researchers who have unrivalled experience in the legal market.
