Patrick G. Duffy

Partner at Stikeman Elliott LLP

Patrick Duffy is a distinguished partner and co-head of the Projects and Infrastructure Group at Stikeman Elliott LLP. His legal expertise is centered on project development, with a comprehensive focus on municipal and planning law, environmental permitting and litigation, energy regulation, and Indigenous engagement. Patrick is highly regarded for his substantial experience navigating complex environmental assessments and regulatory approvals across a broad spectrum of sectors. These include renewable and non-renewable electricity generation, electricity transmission, mining, transit and transportation, aggregate quarries, and waste management.

Clients rely on Patrick’s guidance for responding to environmental inspections, investigations, and prosecutions at both provincial and federal levels. He is a seasoned advocate, having appeared before the Supreme Court of Canada, Federal Court of Canada, all levels of Ontario courts, and numerous administrative tribunals. Patrick is known for his regular appearances before the Ontario Energy Board and the Ontario Land Tribunal, reflecting his prominence in energy and infrastructure law across the province.

He routinely advises both provincial and municipal governments, handling mandates that often involve complex administrative or public law issues, including matters related to public and Indigenous engagement. Patrick’s broad legal acumen makes him a sought-after authority for clients requiring effective navigation of all stages of project implementation and regulatory compliance.

Year Called to Bar: 2004
Phone: (416) 869-5257
Fax: (416) 947-0866
Email: [email protected]

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