Lawyer Profile Detail

Paul R. Cassidy






[email protected]



Osgoode Hall Law School


British Columbia, 1993
Ontario, 1984


Chinese Version

Paul Cassidy is a partner in our Business Law Group in Vancouver and co-head of our National Environmental, Regulatory & Aboriginal Group.

Paul’s practice is a combination of regulatory, corporate/commercial, litigation, policy (business and government) and project development work for clients across North America in a variety of industries, including the energy (conventional, upstream, pipelines, LNG and renewable), marine and terminal shipping, natural resources extraction (mining and forest products), power (generation/transmission), transportation and manufacturing sectors. 

Paul is recognized by all of the major national and international ranking services as one of Canada's leading environmental and energy lawyers. For example, he is one of only 7 Canadian environmental lawyers to receive the highest (Band 1) ranking awarded by Chambers Global and is also recognized by Chambers Canada (Band 1).  He has been listed in Lexpert's Guide to the Leading 500 Lawyers in Canada for 20 consecutive years. In the 2017 edition of The Canadian Legal Lexpert Directory, a guide to the leading law firms and practitioners in Canada, he is the most frequently recommended environmental lawyer in British Columbia and he is repeatedly recommended as a leading lawyer in energy (oil and gas) law. 


  • Represented and led several major energy (conventional and renewable) and mining projects in development stage environmental assessments and operational permitting
  • Advised major energy companies on environmental due diligence strategies
  • Advised major mining, manufacturing, transportation and other companies on responses to environmental enforcement actions
  • Provided environmental crisis management advice as well as general environmental policy and strategic direction
  • Advised on utility regulation matters/electricity generation, transmission and LNG electricity supply agreements
  • Advised on contaminated sites and brownfield development
  • Advised on property acquisitions related to LNG siting, including in depth due diligence on potential sites in British Columbia
  • Advised project proponents and investors on potential LNG greenhouse gas rules, emissions standards and carbon taxes


Paul is recognized for his expertise in many rankings and publications, including:

  • Chambers Canada 2018 (Environmental - Band 1)
  • The Best Lawyers in Canada 2017 (Energy Law, Energy Regulatory Law, Environmental Law, Natural Resources Law)
  • The 2018 Lexpert/American Lawyer Guide to the Leading 500 Lawyers in Canada (Environmental Law)
  • Best Lawyers’ 2016 Vancouver Environmental Law Lawyer of the Year
  • The Canadian Legal Lexpert Directory 2017 (Environmental and Oil & Gas)
  • Lexpert Special Edition: Canada’s Leading Cross Border Lawyers 2016
  • Lexpert Special Edition: Canada's Leading Energy Lawyers 2016
  • Lexpert Special Edition: Canada's Leading Global Mining Lawyers 2016
  • The Legal 500 Guide 2015 (Environmental Law)
  • Law Business Research's The International Who's Who of Environmental Lawyers 2016


Paul has provided expert evidence on Canadian environmental law in U.S. legal proceedings, and he has provided evidence as an independent expert witness to the Canadian Parliament’s Standing Committee of the House of Commons on the Environment.

Paul is a member of several community, business and professional organizations including currently being a member of the Executive Committee of the Board of Governors of the British Columbia Business Council, a past Director of the Society of Contaminated Sites Approved Professionals of British Columbia, a past co-chair of the Canadian Environmental Law Forum, and he has served as a Director of the Association for Mineral Exploration B.C., the Ontario Forestry Association, and the Nature Conservancy of Canada - B.C. Region.

Paul is a frequent lecturer at universities and at management courses on environmental law and management. He has published several articles on environmental issues and was a founding editor of a book on forestry law in British Columbia.

A certified mediator, Paul is a founding member of the Canadian Centre for Environmental Arbitration and Mediation.

Paul received a Certificate in Mediation and Alternative Dispute Resolution from the University of Windsor in 2006, a BA from the University of New Brunswick in 2005, and a JD from Osgoode Hall Law School in 1982. He is a member of the Bars of British Columbia and Ontario.

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McCarthy Tétrault delivers integrated business law, tax, real property, labour and employment, and litigation services nationally and globally through offices in Vancouver, Calgary, Toronto, Montréal, Québec City, as well as in New York City and London, UK.