Overview
Mark Dunn is a partner in the Litigation and Dispute Resolution Group at Goodmans. He has acted as lead counsel to parties involved in complex, and often urgent, disputes before all levels of court in Ontario, the Supreme Court of Canada and arbitral tribunals.
Real estate litigation is a significant part of Mark's practice. He understands the legal principles that apply to, and the business realities of, real estate disputes, and has litigated joint venture, lease, mortgage enforcement and trust disputes, among others relating to real estate. He has also represented owners and contractors on a number of significant construction disputes.
Mark has also developed significant expertise in corporate and securities litigation, including litigation arising from disputed proxy contests, class proceedings relating to alleged misrepresentations and class proceedings commenced under the Competition Act. He has acted in significant cases relating to breaches of contract, shareholder disputes and corporate oppression. Mark also has experience with the quantification of large and complex damages claims.
Mark also carries on an active insolvency and restructuring practice, which includes acting for court-appointed officers, creditors and other stakeholders in litigation and restructuring proceedings. He appears regularly before the Commercial List in Toronto.
Mark has also acted on a variety of shareholder disputes, including oppression claims, shareholder class actions and proxy contest litigation. He provides strategic advice to, and litigates on behalf of, companies, shareholders and directors.
Mark also acts for victims of civil fraud, having led efforts to investigate, identify and prove fraud, freeze assets obtained by fraud and maximize recovery for affected victims. In addition to recovering assets, Mark has advised victims on how to prevent or address negative publicity and other collateral consequences of fraud.
Mark is recognized by Benchmark Litigation Canada as a "Future Star", and for corporate and commercial litigation by The Canadian Legal Lexpert Directory and Best Lawyers in Canada.
Expertise
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Arbitration - Domestic and International
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Construction and Infrastructure
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Corporate and Commercial Litigation
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Crisis Management and Urgent Proceedings
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Insolvency Litigation
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Litigation and Dispute Resolution
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Mergers and Acquisitions
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Real Estate Litigation
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Securities Litigation
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Shareholder Activism
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White Collar Defence and Investigations
Featured Work
Mark’s representative work includes acting as:
- lead litigation counsel for the court-appointed manager-receiver in more than 200 court appearances before the Commercial List, Ontario Court of Appeal and Supreme Court of Canada in a complex multi-year case involving allegations of fraud against the former operators of a real-estate development portfolio and the court-supervised sale of 28 commercial and industrial properties with an aggregate value close to $200 million
- lead counsel to one of the owners of a proposed $100 million real estate development project in litigation and arbitration against the other owner, including a successful effort to obtain an urgent Order requiring specific performance of a Purchase Agreement so that the development could proceed and a successful claim for damages caused by the breach of the joint venture agreement.
- co-counsel to a public company in successful litigation against a dissident shareholder group in the context of a contentious proxy contest.
- lead counsel to creditors that advanced more than $20 million to a business in connection with complex recovery efforts involving insolvency proceedings and claims against the former officers and directors of the business; obtained summary judgment against the officers and directors in connection with certain debts owed by the company (upheld on appeal) and a trial judgment requiring the transfer of certain real estate from the officers and directors to the corporation
- lead counsel to the successful claimant in a multi-million dollar arbitration relating to a Share Purchase Agreement and subsequent enforcement proceedings
- lead counsel to the successful applicant in oppression proceedings relating to the conduct of litigation carried on in the name of a corporation
- lead counsel to an industry leading business in connection with the investigation of, and successful arbitration and litigation relating to, a major fraud perpetrated by a contractor
- lead counsel to one of the partners in a major real estate development enterprise in litigation, arbitrations and negotiations relating to the dissolution of the enterprise
- counsel to the deposit insurer in connection with the largest credit union liquidation in the history of Ontario, including acting on several successful collection actions against former members and actions for fraud, breach of fiduciary duty and negligence against former officers, directors and outside consultants
Awards & Recognition
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Best Lawyers in Canada Recognized, Corporate and Commercial Litigation 2025
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Benchmark Canada Future Star 2024
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The Canadian Legal Lexpert Directory Recognized, Litigation - Corporate Commercial 2024
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Best Lawyers in Canada Recognized, Corporate and Commercial Litigation 2024
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The Canadian Legal Lexpert Directory Recognized, Litigation - Corporate Commercial 2023
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Best Lawyers in Canada Recognized, Corporate and Commercial Litigation 2023
Credentials
Professional Involvement
Credentials
- Osgoode Hall Law School, LL.B., 2007
- Western University, B.A., 2004
Professional Affiliations
- Law Society of Ontario
Call to Bar
- 2008 Ontario
Insights
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Crisis Management and Urgent Proceedings
Panoramic Next: Crisis Management 2024 - Canada Chapter
Mark Dunn and Sarah Stothart co-authored the Canada Chapter of Panoramic Next: Crisis Management 2024. Through a series of interviews with expert legal… -
Crisis Management and Urgent Proceedings
Market Intelligence Crisis Management 2023 - Canada Chapter
Mark Dunn and Sarah Stothart co-authored the Canada Chapter of Market Intelligence Crisis Management 2023. Market Intelligence offers readers a highly accessible take on the crucial issues of the…
News & Events
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100+ Goodmans lawyers recognized in The Best Lawyers in Canada: 2025 Edition
We are delighted to share Goodmans has once again been recognized in the 2025 edition of The Best Lawyers in Canada with 105 lawyers featured across 43 practice areas.Congratulations to Andrew Brodkin… -
Litigation and Dispute Resolution
Goodmans Recognized in the 2024 edition of Benchmark Litigation Canada
We are proud to announce that we have once again been recognized in the 2024 edition of Benchmark Litigation Canada.16 Goodmans lawyers have been recognized as being the country’s most… -
Banking and Financial Services
The Canadian Legal Lexpert Directory 2024 Continues to Recognize Goodmans
We are proud to announce Goodmans LLP has once again been recognized in the 2024 edition of The Canadian Legal Lexpert Directory.91 Goodmans lawyers have been recognized as top-tier in their…