Expertise
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Practice Areas:
Bar Admissions:
Education:
- University of Toronto (2001) JD (Honours Standing)
- University of Toronto (1998) MA
- Carleton University (1997) BA (Highest Honours)
Details
- Bio
- Cases
- Associations
- News & Media
- Publications & Presentations
- Recognition
Matthew Sammon
Recognized as a leading and formidable trial counsel, Matthew has extensive litigation experience across a broad range of areas, including complex corporate and commercial litigation, professional liability and medical malpractice, and employment cases. He regularly conducts trials, regulatory hearings, and arbitral proceedings.
His roster of clients have included large and mid-sized corporations across a wide range of sectors, including financial services, banking, telecommunications, retail, health care, manufacturing, hospitality, and oil and gas. He also acts regularly for executives and other individuals in civil and regulatory disputes.
Matthew provides employment advice to a number of industries, and has extensive litigation experience in employment disputes, including wrongful dismissal, the enforcement of restrictive covenants, unfair competition, and the misappropriation of trade secrets. He has developed broad practical and legal experience in digital forensic investigations, including in Anton Piller injunctions and proceedings involving internet defamation and identity theft.
Matthew also has deep experience in professional regulation and medical malpractice litigation, appearing regularly as lead counsel in complex medical litigation and regulatory proceedings.
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Counsel to the applicant Estate Trustee in a successful oppression application, and on appeal. The application judge ordered the wind up of the respondent corporation, based on grave breaches of fiduciary duties by the personal respondents, including the usurpation of a significant real estate opportunity. The divisional court affirmed the application judge’s remedy and findings.
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Counsel to Cineflix and related entities in a proposed class action relating to the alleged misclassification of independent contractors in the television production industry.
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Counsel to the respondent on an appeal in a seminal internet defamation case. The Court of Appeal for Ontario clarified the law of concerted action liability and upheld a very large damages awards for what it characterized as a prolonged, persistent and vicious internet campaign.
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Counsel to the successful defendant physician in a medical negligence trial relating to the performance of a laparoscopy and vaginal resection.
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Estate Trustee During Litigation for the Estate of Paul Penna v Landen
Counsel to Estate Trustee During Litigation of the Paul Penna Estate in a series of proceedings, including two appeals to the Ontario Court of Appeal and a contempt trial, arising out of a massive fraud perpetrated by former Estate Trustee in his administration of the Estate.
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Counsel to a corporate plaintiff in a complex series of disputes involving the alleged oppressive conduct of a departing executive.
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Sazant v College of Physicians and Surgeons of Ontario
Counsel to intervener physicians in a constitutional challenge to a provision of the Regulated Health Professions Act.
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Counsel to defendants/applicants, Michael Cytrynbaum and First Fiscal Management Ltd., in an application, and on appeal, for advancement of legal expenses in an action alleging breach of fiduciary duties and unjust enrichment in connection with the sale of a company's assets.
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Counsel to the defendants physicians in a medical negligence proceeding, including on a motion for summary judgment on the basis that the limitation period had expired.
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Rowley v High Strength Plates &Profiles Inc
Counsel to the defendant in a wrongful dismissal proceeding. The defendant was successful in resisting plaintiff's allegations of constructive dismissal.
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Canadian Bar Association
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Ontario Bar Association
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The Advocates' Society
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Legal 500 Recognizes Lenczner Slaght as a “Litigation Powerhouse”
Legal 500 distinguishes Canada’s leading litigation firm for its “deep bench and first-class trial experience.”
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Chambers Canada Recognizes Lenczner Slaght as a Top-Tier Litigation Firm
Canada’s leading litigation firm and its expert litigators continue to advance their position in the latest edition of world-renowned directory, Chambers Canada, with nine new rankings.
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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 Named Firm of the Year in Medical Defense/Health
Canada’s leading litigation firm is proud to announce that we have been singled out for our Medical Defense and Health Law expertise at last week’s 2019 Benchmark Canada Awards.
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Lenczner Slaght Recognized as a Top-Tier Litigation Firm by Legal 500
Legal 500 recognizes Lenczner Slaght as the “best litigation boutique in Canada.”
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Who’s Who Legal Recognizes Lenczner Slaght’s Litigation Dominance
Eight Lenczner Slaght lawyers are recognized globally for their superb litigation 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’s Big Suits: Rutman v. Rabinowitz
Rutman v. Rabinowitz featured in the 2018 summer issue of Lexpert Magazine as one of the Top Big Suits of 2018. In this particular litigation of significance, Lenczner Slaght's Matthew Sammon and Jessica Roher were counsel to the respondent, Ronald Rutman.
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Defamation in the Social Media Sphere
Matthew Sammon spoke at the Ontario Bar Association's program Social Media and Internet Law: Your Comprehensive Guide. He shared his expert insight on the social media landscape and how to keep pace with this evolving area of the law.
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Matthew Sammon and Risa Kirshblum spoke at the 2018 National Conference & World Summit. This panel of employment litigators and experienced in-house counsel shared practical tips on topics including non-competition and non-solicitation provisions, confidentiality obligations, employees duties’ to former employers and steps to respond to and manage improper departures.
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When Family Law Collides: Essential Interdisciplinary Issues
Matthew Sammon was a faculty member at the 2018 Ontario Bar Association’s Institute. He shared his valuable insight on the panel "Closely-Held Corporations: Dealing with Oppression."
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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... -
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... -
Practical Tools to Reduce your Organization's Risk with Social Media Use
Matthew Sammon, Jaan Lilles and Dena Varah conducted a webinar as part of the Canadian Corporate Counsel Association/Canadian Bar Association's Webinar Series on October 17, 2014 from 12:00pm to 1:30 pm.
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10th Annual Update on Personal Injury Law and Practice
Matthew Sammon will be a speaker at Osgoodes 10th Annual Update on Personal Injury Law and Practice taking place on September 30, 2014.
- Matthew Sammon's article The future of unconventional restrictive covenants appeared in the July 11, 2014 issue of the Lawyers Weekly."The recent case...
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35th 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... -
Social Media and Internet Law - Forms and Precedents
Matthew Sammon and Constanza Pauchulo co-authored a chapter published in Social Media and Internet Law.
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Lexpert/ROB Special Edition: Canada's Leading Litigation Lawyers (2016-2017)
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Benchmark Canada (2015-2019)
Litigation Star - General Commercial, Professional Liability
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Benchmark Canada (2019)
Labour Employment Attorney of the Year
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Best Lawyers in Canada (2014-2020)
Corporate & Commercial Litigation, Health Care Law, Medical Negligence
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Canadian Legal Lexpert® Directory (2013-2019)
Litigation - Corporate Commercial, Medical Negligence, Professional Liability
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Chambers Canada (2020)
Healthcare (Nationwide – Canada)
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Lexpert Guide to the Leading US/Canada Cross-border Litigation Lawyers in Canada (2014-2017)
Corporate Commercial Litigation, Litigation Lawyer to Watch (2014)
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Lexpert Rising Stars (2013)
Leading Lawyers Under 40
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The Legal 500 Canada (2018-2020)
Labour and Employment (Recommended Lawyer)
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Who's Who Legal: Litigation (2018)
Future Leader