This is a photo of Ryan MacIsaac photo




Contact by email at [email protected]

t. 416-601-8135


Law School

University of Toronto

Bar Admission

Alberta, 2013
Ontario, 2016

Ryan MacIsaac is of Counsel in our Litigation group. Ryan’s specialized expertise includes data breach response, privacy and cybersecurity, class actions defence, complex commercial litigation, and public law issues. He combines deep legal knowledge and analytical rigor with a practical, goal-oriented approach.

Ryan has defended clients in data breach class actions and works with international counsel to coordinate global breach response strategy.

He regularly advises on freedom of information (FOI) issues, and has assisted institutions, affected third parties, and requesters—both at first instance and on appeal to the Information and Privacy Commissioner. He has engaged regulators at the federal and provincial levels.

His practice is deeply rooted in administrative law; Ryan has commenced judicial review applications for clients challenging government or tribunal decisions on, among other things, access to information, pharmaceutical formularies, environmental orders, and municipal procurement. He has challenged municipal business and transportation licensing decisions. Since 2017, Ryan has been an Executive Member of the Ontario Bar Association’s Administrative Law Section.

As part of his regulatory practice, Ryan works with numerous domestic and international clients who sell, serve, or import liquor and alcohol products in Ontario and Alberta. He advises on liquor licensing, regulation and compliance.

Ryan has a national practice that leverages the Firm’s Canada-wide platform. In 2016, he was seconded to Uber, giving him valuable client-side insight on legal service delivery. He is a member of the Law Society of Ontario, the Law Society of Alberta, the Advocates’ Society, and the Ontario Bar Association.

Representative mandates include:

  • Defending a technology company against a national data breach class action, and advising on related dealings with provincial and federal Privacy Commissioners.
  • Defending a major financial institution against a national data breach class action.
  • Counsel to a company applying for judicial review to quash a privacy breach notification decision of an Information and Privacy Commissioner.
  • Consulting on the emerging open banking sector in respect of companies’ exposure to privacy/cybersecurity regulatory and civil liability.
  • Advising and drafting submissions for companies resisting disclosure of their sensitive commercial information following FOI requests.
  • Counsel to a company applying for judicial review to quash a FOI disclosure decision of an Information and Privacy Commissioner.
  • Advising companies on disputes with software/IT vendors, including in the finance space.
  • Counsel to a technology company resisting an injunction application brought by a municipal government for alleged bylaw violations (2015 ABQB 214).
  • Counsel to a liquor licence applicant in a contested public interest hearing to licence an innovative cultural space in a vibrant Toronto neighbourhood (2019 CanLII 37556).
  • Assisting a U.S.-based client obtain liquor licenses for its restaurant locations across Canada.
  • Representing management and dissidents in proxy contests, including in the non-profit sector (2018 ONSC 7781; 2019 ABQB 107).
  • Counsel to a company on appeal of a contract rectification order that was challenged by the federal tax authority (2017 ONCA 763).
  • Counsel to a U.S.-based organization in a summary judgment motion to recover substantial damages for an elaborate fraud and breach of a go-kart purchase and sale agreement (2018 ONSC 4549).
  • Counsel to a pharmaceutical company applying for judicial review of a decision to list certain drugs as interchangeable on the provincial drug benefit formulary (2019 ABQB 610).

Representative pro bono and community involvement includes:

  • Executive Member of the Ontario Bar Association’s Privacy and Access to Information Section.
  • Representing an intellectually disabled client appealing from her criminal conviction for fraud (2019 ONCA 568).
  • Advising the non-profit La Tablée des Chefs on regulatory and corporate matters as it expands its programs—redistributing excess food from hotels and restaurants to the less fortunate, and teaching culinary skills to youth—across Canada.
  • Acting as a designated representative (similar to litigation guardian) for minors making refugee claims before the Immigration and Refugee Board.
  • Mentoring students at the University of Toronto’s New College and Faculty of Law.
  • Volunteering with trial advocacy education programs taught through Ryerson University’s Law Practice Program (LPP) and other institutions.