Duff Harper
Partner | Calgary
Calgary: 403-260-9710

Duff practises in the areas of environmental law, commercial litigation and regulatory law. He routinely acts for clients on environmental due diligence and liability issues, especially as they pertain to brownfield redevelopment. He has acted as lead counsel in several litigation cases involving contaminated sites, both on behalf of contaminated property owners and parties who were allegedly responsible for the contamination.

Duff has appeared before numerous levels of courts and assessment tribunals, including tribunals constituted pursuant to the Canadian Environmental Assessment Act (CEAA).

Duff also provides strategic regulatory environmental compliance and environmental impact assessment advice to industrial clients, such as conventional oil and gas companies, mining companies, companies operating in the oil sands, and liquefied natural gas proponents.


Recent representative matters including acting as counsel for:

  • Companies involved in the purchase of greenhouse gas credits
  • Companies performing environmental due diligence reviews associated with potential mergers and acquisitions
  • Area residents at the CEAA Panel Review of Sydney Tar Ponds and Coke Oven Sites in Nova Scotia
  • A land developer challenging a decision by the provincial Minister of Environment and the use of ministerial discretion
  • A mining company in an environmental audit of mining reclamation operations
  • Financial institutions and developers in the financing and development of various waste-energy power-generation facilities and wind-power projects
  • Underwriters performing environmental reviews involving initial public offerings and prospectuses of various companies, particularly those operating in the oil sands
  • The Office of the Auditor General of Canada (Commissioner of the Environment and Sustainable Development) on various audits

Duff has been recognized as a leading environmental law practitioner in the following publications:

  • The Legal 500 Canada 2018 (Environmental)
  • Chambers Canada 2018 (Environmental)
  • The Best Lawyers in Canada 2018 (Administrative and Public Law and Environmental Law)
  • Who's Who Legal: Canada 2017 (Environmental)
  • The Canadian Legal Lexpert Directory 2014 (Environmental Law)
  • PLC Which Lawyer?
Show Past:
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Co-author: An Overview of Various Provincial Climate Change Policies Across Canada and Their Impact on Renewable Energy Generation
Energy Regulation Quarterly, Vol. 4, No. 4, November 2016.
Blakes Bulletin on Energy - Regulatory, Environmental, and Tax, June 13, 2016.
Blakes Bulletin on Environmental Law/Litigation & Dispute Resolution
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