Expertise
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Practice Areas:
- Bar Admissions:
- Education:
- Osgoode Hall Law School (1996) LLB
Details
- Bio
- Cases
- Associations
- Blog Posts
- News & Media
- Publications & Presentations
- Recognition
Mark Veneziano
"Mark is very strategic, practical and technically sound. He is a true partner and understands his clients’ business." — Chambers Canada
Mark has a broad-based litigation practice, encompassing commercial litigation, professional liability, shareholder disputes, insurance coverage, securities, construction and real estate law. His clients range from corporations and physicians to stockbrokers and banks.
Mark provides his clients with practical advice aimed at efficiently resolving disputes. However, when the case demands, he is willing and prepared to go to trial. Mark is an experienced trial lawyer. He has conducted dozens of trials as lead counsel in commercial, securities and medical negligence matters. He regularly acts as lead counsel in commercial arbitrations. Mark has significant experience in the area of professional regulation, and appears frequently before the College of Physicians and Surgeons of Ontario and other administrative and regulatory tribunals.
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Counsel to a defendant developer in an alleged oppression matter.
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Counsel to a physician in rare medical malpractice case before the Supreme Court of Canada, which discussed interesting issues relating to the standard of care.
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Fraudulent and Deceptive Web Domains Dispute
Counsel to an infrastructure company related to the takedown and transfer of a fraudulent web domains. Provided strategic advice on intellectual property portfolio and assertion of the same.
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Jardine Lloyd Thompson Canada Inc v Aon Reed Stenhouse Inc
Counsel to Jardine Lloyd Thompson in an action alleging breach of fiduciary duties, breach of contract and misappropriation of confidential information.
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Del Ridge Homes Inc v Ledgemark Homes Inc
Counsel to a sustainable real estate developer, Del Ridge Homes Inc, in a trademark infringement, false advertising, and unfair competition action in the Federal Court of Canada.
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Tri-South Developments Inc v 583167 Ontario Inc
Counsel to the Plaintiff developer in a breach of contract case concerning a real estate development.
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New York Brand Studio Inc ats 110 Spadina Avenue Inc
Counsel to the Respondent tenant in a breach of contract dispute with a landlord. The proceedings were resolved by way of settlement.
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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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Armstrong v Royal Victoria Hospital
Appealed successfully on behalf of the defendant physician in a case of alleged negligence relating to a ureteric injury during a colectomy.
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Counsel to the successful defendant physician in a medical malpractice trial involving allegations that the physician was negligent in his management of shoulder dystocia during delivery. Decision includes important consideration of the causation principles applicable to medical malpractice actions generally.
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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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When Does the Clock Start: Limitation Periods in Contractual Claims for Indemnification
The hardest mistake to fix in litigation may be missing the limitation period. Almost every other mistake can be fixed, but missing that critical window for bringing a claim can be catastrophic.
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Lo Faso brings up the tension between fair and just court process and ensuring that all facts are available to adjudicate a dispute.
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Is an expansion of banks' duties to non-customers on the horizon?
Following the Ontario Court of Appeal's 2010 decision in Dynasty Furniture Manufacturing Ltd. v. Toronto Dominion Bank (2010 ONCA 514), many legal observers believed that the court had closed the door on a bank's liability for negligence in the absence of actual knowledge of fraudulent activities conducted through an account of its customer.
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Chambers Canada Recognizes Lenczner Slaght’s Deep Bench of Expert Litigators
Canada’s leading litigation firm continues to advance their position in the latest edition of the world-renowned directory.
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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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The 2024 Lexpert Directory Recognizes Lenczner Slaght’s Litigation Excellence
Lenczner Slaght’s litigators continue to be recognized by their peers as the foremost practitioners in their fields.
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Lexpert Recognizes Lenczner Slaght’s Litigation Strength
An increasing number of our expert litigators continue to be recognized as the foremost lawyers in their fields by peers and senior members of the legal profession.
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Lenczner Slaght Stands Out as a Top-Tier Litigation Firm in Legal 500 Canada
Canada’s leading litigation firm is once again recognized as a “litigation powerhouse” according to Legal 500 Canada.
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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 be recognized by world-renowned directory, Chambers & Partners.
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Lenczner Slaght Litigators Recognized as Best Lawyers in Canada
In the latest edition of Best Lawyers in Canada, 41 of our expert litigators are recognized for their expertise across 24 practice areas. The following lawyers have also been recognized as “Lawyer of the Year” for receiving the highest overall peer-feedback in their practice areas in Toronto.
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Lenczner Slaght’s Litigation Excellence Recognized in 2023 Lexpert Directory
Following comprehensive peer review surveys and interviews with senior members in the legal profession, the 2023 Canadian Legal Lexpert Directory has recognized 31 of the firm’s expert litigators for their experience, knowledge, and precision, with 108 rankings spanning 17 practice areas.
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Lenczner Slaght Stands Out as a “Litigation Powerhouse” in Legal 500 Canada
Canada’s leading litigation firm is once again ranked in Tier 1 for Dispute Resolution by Legal 500 Canada.
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Lenczner Slaght Litigators Recognized Among the Best Lawyers in Canada
In the latest edition of Best Lawyers in Canada, 39 of our expert litigators are recognized by their peers for their expertise across 24 practice areas.
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Mark Veneziano and Nina Bombier were invited to share their expertise at The Advocates' Society's acclaimed annual workshop, "Do a Trial!". This program offers a unique opportunity for lawyers to test their trial skills in a real courtroom before a judge. Mark and Nina will guide participants on developing trial strategy, preparing and examining witnesses, and delivering persuasive opening and closing statements.
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Mark Veneziano was invited to share his expertise at The Advocates' Society's acclaimed annual workshop "Do a Trial!". The program offered a unique opportunity for lawyers to test their trial skills in a real courtroom before a judge.
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Mark Veneziano shared his expertise at The Advocates' Society's acclaimed annual workshop "Do a Trial!".
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Continuing Medical Education Seminar: Obstetrical Malpractice
Tom Curry and Mark Veneziano shared their expertise at Mount Sinai Hospital's Continuing Medical Education Seminar. Tom discussed "Accountability for Expert Witnesses," while Mark presented on the topic of "Partogram: What is the Dilemma?".
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MLST’s 8th Annual Pot-Pourri of Medico-Legal Cases
Mark Veneziano spoke at the Medico-Legal Society of Toronto's 8th Annual Pot-Pourri program. He shared his expert insight on recent cases and trending topics in health law.
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Mark Veneziano presented at The Advocates' Society's annual workshop "Do a Trial!" As an experienced trial lawyer, he provided expert advice on how to develop a team trial strategy and how to prepare witnesses.
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Obstetrical Malpractice: A Survival Guide for 2018
Mark Veneziano presented at Mount Sinai Hospital's Continuing Medical Education Seminar on the topic of "How Are Assisted Conception Babies Different than Spontaneous Ones?"
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Expert Strategies for Trial Preparation
Mark Veneziano presented at the Ontario Bar Associations's professional development program Averting Catastrophe: How to Deal with Everything that Goes Wrong at a Trial on November 24, 2017.
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A Litigator's Guide to the Challenging Lawyer-Client Relationship
Mark Veneziano presented Effective Strategies with Challenging Client Relationships at the Law Society of Upper Canada Event "A Litigator's Guide... -
The Advocates' Society: Do a Trial!
Mark Veneziano presented at The Advocates' Society event Do a Trial! on April 1, 2017.
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Benchmark Canada (2014-2024)
Litigation Star – Commercial
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Best Lawyers in Canada (2013-2025)
Construction Law, Corporate & Commercial Litigation, Health Care Law, Insurance, Medical Negligence, Real Estate Law
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Best Lawyers in Canada (2018)
Toronto "Lawyer of the Year" in Health Care Law
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Canadian Legal Lexpert® Directory (2012-2024)
Litigation - Commercial Insurance, Litigation - Corporate Commercial, Medical Negligence, Professional Liability
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Chambers Canada (2024-2025)
Healthcare: Contentious (Nationwide – Canada)
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Lexpert Rising Stars (2009)
Leading Lawyers Under 40
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Lexpert Special Edition: Canada's Leading Health Sciences Lawyers (2021)
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Lexpert Special Edition: Canada's Leading Infrastructure Lawyers (2020-2021)
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Lexpert Special Edition: Canada's Leading Litigation Lawyers (2016-2018, 2020-2021, 2023)
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Lexpert® Guide to the Leading US/Canada Cross-border Litigation Lawyers in Canada (2014)
Corporate Commercial
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