Expertise
-
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.
-
Heidelberg Materials Canada Limited v Toronto Port Authority (PortsToronto)
Counsel to the Respondent, Toronto Port Authority (PortsToronto), in an urgent application for judicial review of a decision of the Minister of Transport. We obtained a dismissal on all issues, including the dismissal of a motion to strike PortsToronto’s responding evidence.
-
Edgewood Health Network Inc v Joanna Anderson
Independent Supervising Solicitor for the execution of an Anton Piller order.
-
Counsel to a defendant developer in an alleged oppression matter.
-
Counsel to a physician in rare medical negligence case before the Supreme Court of Canada, which discussed interesting issues relating to the standard of care.
-
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.
-
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.
-
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.
-
Tri-South Developments Inc v 583167 Ontario Inc
Counsel to the Plaintiff developer in a breach of contract case concerning a real estate development.
-
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.
-
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. Counsel at the Court of Appeal for Ontario in successfully upholding the trial decision of the Honourable Justice Centa.
-
The Advocates' Society
-
Canadian Bar Association
-
Ontario Bar Association
-
Talk Isn’t Cheap: Ontario Court of Appeal Upholds Oral Agreement for the Sale of Land
In its recent judgment in 2730453 Ontario Inc v 2380673 Ontario Inc, the Ontario Court of Appeal upheld the trial decision of the Honourable Justice Centa, which awarded specific performance to the Purchaser (successfully represented by Lenczner Slaght) for the Vendor’s breach of an oral agreement for the purchase and sale of a 32-acre parcel of land for development. In doing so, the Court clarified the legal requirement that a prospective purchaser must prove “detrimental reliance” in undertaking acts of part performance before an oral agreement will be enforced in the face of the Statute of Frauds.
-
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.
-
Lo Faso brings up the tension between fair and just court process and ensuring that all facts are available to adjudicate a dispute.
-
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.
-
2025 Lexpert Directory Highlights Lenczner Slaght’s Excellence in Advocacy
Peers and senior members of the legal profession across the country continue to recognize the depth and breadth of Canada’s leading litigation firm in the latest 2025 Canadian Legal Lexpert Directory.
-
Ontario Court of Appeal Upholds Finding of Part Performance of Oral Agreement to Sell Land
Canadian Lawyer recently published an article discussing the decision in 2730453 Ontario Inc v 2380673 Ontario Inc, where our expert litigators, Mark Veneziano and Jonathan D. Langley, represented the successful land developer at The Ontario Court of Appeal. The Court upheld the trial judge’s findings that the equitable doctrine of part performance was applicable in enforcing an oral agreement for the sale of land.
-
Lenczner Slaght Lawyers Recognized as Canada’s Leading Litigators
Following an in-depth peer review process across the legal profession, 21 Lenczner Slaght lawyers have been recognized in the 2024 Lexpert Special Edition: Canada’s Leading Litigation Lawyers guide for their extensive courtroom experience and subject-matter expertise.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
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.
-
Compare and Contrast Hard Versus Soft Openings in the Shutt v Carabiner Case
Mark Veneziano was invited to share his expertise on “Mediation Advocacy” as part of Osgoode Hall’s Professional LLM in Dispute Resolution graduate program. Mark presented on the session Compare and Contrast Hard versus Soft Openings in the Shutt v Carabiner Case.
-
Mark Veneziano and Nina Bombier were invited to share their expertise at The Advocates' Society's acclaimed annual workshop, "Do a Trial!". This program offered a unique opportunity for lawyers to test their trial skills in a real courtroom before a judge. Mark and Nina guided participants on developing trial strategy, preparing and examining witnesses, and delivering persuasive opening and closing statements.
-
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.
-
Mark Veneziano shared his expertise at The Advocates' Society's acclaimed annual workshop "Do a Trial!".
-
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?".
-
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.
-
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.
-
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?"
-
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.
-
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...
-
Benchmark Canada (2014-2025)
Litigation Star – Commercial
-
Best Lawyers in Canada (2013-2025)
Construction Law, Corporate & Commercial Litigation, Health Care Law, Insurance, Medical Negligence, Real Estate Law
-
Best Lawyers in Canada (2018)
Toronto "Lawyer of the Year" in Health Care Law
-
Canadian Legal Lexpert® Directory (2012-2025)
Litigation - Commercial Insurance (2024), Litigation - Corporate Commercial, Medical Negligence, Professional Liability
-
Chambers Canada (2024-2025)
Healthcare: Contentious (Nationwide – Canada)
-
Lexpert Rising Stars (2009)
Leading Lawyers Under 40
-
Lexpert Special Edition: Canada's Leading Health Sciences Lawyers (2021)
-
Lexpert Special Edition: Canada's Leading Health Sciences Lawyers (2025)
-
Lexpert Special Edition: Canada's Leading Infrastructure Lawyers (2020-2021)
-
Lexpert Special Edition: Canada's Leading Litigation Lawyers (2016-2018, 2020-2021, 2023-2024)
Show more