Dennis Mahony

Dennis stands at the forefront of Torys’ Environmental, Health and Safety Practice and co-leads the firm's Climate Change and Emissions Trading Practice. His expertise is recognized by the Law Society of Ontario, where he's a certified Environmental Law Specialist.

His clientele spans a vast array of sectors, from utilities and energy to manufacturing and real estate, advising on compliance, project development, and litigation. Dennis excels in navigating complex environmental challenges, from planning through to litigation, making significant contributions to major projects across the nation.

His work extends to guiding transactions through environmental due diligence, shaping the negotiation and execution of deals with an environmental focus. Dennis's regulatory insights cover a broad spectrum, including environmental assessments, contaminated sites, and climate change, ensuring clients stay ahead in compliance and strategic planning.

Notably, Dennis played a pivotal role in the Milton Logistics Hub Project, leading legal strategies through intricate approval processes and court proceedings, showcasing his ability to manage high-stake environmental cases successfully.

Awards and recognitions spotlight his leadership in environmental law, marked by consistent acknowledgment from Chambers Canada, The Legal 500, and Best Lawyers in Canada.

Beyond his practice, Dennis's contributions extend to academia and professional circles. He's an adjunct professor at the University of Toronto, sharing his knowledge on climate change law, and actively participates in significant legal associations, shaping the dialogue on environmental and energy law on national and international platforms.

Dennis's educational background includes an LLB from the University of Toronto and a BA from the University of Calgary, with his bar admission in Ontario in 1995. His deep legal acumen combined with a proactive approach to environmental and safety issues places him as a distinguished figure in the field.