Dennis E Mahony

Practice Areas

A leading lawyer in his field, Dennis has specialized knowledge in environmental law. From regulatory compliance to courtroom advocacy, Dennis works closely with clients on bespoke tactics to mitigate risk and maximize opportunity in environmental matters impacting clients’ operations, projects and transactions.

Dennis is the head of Torys’ Environmental, Health and Safety Practice, the Co-Chair of the firm’s interdisciplinary Climate Change and Emissions Trading Practice and is certified by the Law Society of Ontario as a Specialist in Environmental Law.

Dennis provides comprehensive environmental, health and safety advice to a broad range of public- and private-sector clients, including public and private companies, federal government agencies, Crown corporations, provincial bodies and municipalities.

On projects, Dennis works alongside developers, lenders, technical consultants, regulators and other project stakeholders to plan, develop, permit and defend complex projects, often through sensitive environmental habitats. He regularly advises from the project planning stage through the approval and construction stages and into operation.

Dennis also assists buyers, sellers, lenders and investors through all environmental aspects of a transaction: from acquisition diligence and agreement negotiation, to the design and coordination of deal-specific environmental liability assessments, negotiation of agreements and in handling closing and post-closing details.