James M. Regan KC

As a patent and trademark lawyer Toronto-based, Mark D. Penner’s practice focuses on all aspects of the acquisition, protection, enforcement and strategic use of a wide range of intellectual property assets in Canada and around the world. Acting for a range of clients, from individual inventors, start-ups and other early stage companies to large multinational companies, Mark provides strategic advice in a variety of technology areas, including biotechnology, chemistry, energy, social me...

Stephen A. Pike is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law and Director and Officer Liability Practice. Stephen A., who practices law in Toronto, Ontario, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Stephen A. is held by other top lawyers in the same geographic and legal practice area.

Jeremy Devereux acts as an advocate and negotiator in a wide range of complex commercial and regulatory matters. His experience includes securities and financial services disputes, regulatory investigations and prosecutions, corporate and commercial litigation, class actions, employment law, estates litigation, mining law and administrative law. He has appeared as counsel before the Ontario courts, the Federal Court of Canada, and numerous tribunals and arbitration panels. Mr. Devereux freque...

Sarah Armstrong is the Chair of Fasken’s Ontario Litigation and Dispute Resolution Practice Group. An experienced and strategic litigator with broad litigation, arbitration and dispute resolution experience, she has developed a robust practice focused on commercial and contractual disputes and class action defence. Sarah is also a member of Fasken’s Ontario Professional Development Committee and is Co-Chair of the firm’s Ontario Pro Bono Committee. Working with clients acros...

Errol Tenenbaum is a top lawyer recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Errol, who practices law in Toronto, Ontario, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Errol is held by other top lawyers in the same geographic and legal practice area. Errol Tenenbaum, Partner in the Tax and Wills & Estates Groups at Robins Appleby LLP, has over 20 years of experience advising ...

Darcy Romaine is a trial lawyer for the seriously injured. He has won trials where liability is complex and where the injuries involve catastrophic brain injury, complicated orthopaedic injury, and severe burn injury. Professionally, he is best known for his trials involving municipal negligence and his courtroom efforts to have regulations governing municipality maintenance obligations struck for providing unsafe and inadequate levels of care to the motoring public. Darcy has also acted as o...

Peter Pliszka, a senior partner in Fasken’s Litigation Group, is regarded as one of Canada’s leading litigation lawyers. Peter’s practice is focused primarily on product liability, class action, commercial and insurance litigation matters, and it is national in scope. Peter conducts litigation proceedings across Canada and has appeared at all levels of court in Ontario and other Canadian provinces as well as the Supreme Court of Canada. Peter is Fasken’s Chair-Life Sci...

Mary Kelly practises business law, and has considerable experience relating to company, banking and regulatory requirements as applied to private mergers and acquisitions, secured lending, corporate reorganizations and business joint ventures. Her diverse experience in private mergers and acquisitions includes advising financial institutions on divestiture options for non-core businesses and implementing successful international auction sales on behalf of multinational clients, including thos...

Renowned for his ability to develop innovative strategies that solve complex labour relations problems, Brett has appeared as counsel for employers in hundreds of administrative and court proceedings at both the federal and provincial level. He frequently represents employers in collective bargaining negotiations and provides strategic advice on managing a wide variety of labour relations issues. Certified as a Specialist in Labour Law since 1998, Brett is widely recognized as one of the coun...

John A. Olthuis is one of the founding partners of OKT. His practice includes litigation, comprehensive and specific land rights, self-government, and impacts and benefits agreements. John was on the legal team of the Assembly of First Nations in negotiations with Canada and the provinces lending to the inclusion of "Section 35" in Canada’s repatriated Constitution in 1982. John was legal counsel to Chiefs of Ontario and table negotiator at the Aboriginal Government table for the Assemb...