Heather L. Treacy, Q.C.: Lawyer with DLA Piper (Canada) LLP

Heather L. Treacy, Q.C.

Calgary,  AB  Canada

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BV® Distinguished

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Practice Areas

  • Aviation
  • Class Actions
  • Conflict Management and Alternative Dispute Resolution
  • Projects
  • Energy and Infrastructure
  • Mass Torts and Product Stewardship
  • Environment
  • Litigation
  • Arbitration and Investigations
  • Oil and Gas
  • Product Liability
Contact InfoTelephone: 403.294.3589
Fax: 403.697.6623
University Royal Conservatory of Toronto and Mount Royal College, Music Degrees, 1984; University of Calgary, B.Comm., 1984
Law SchoolUniversity of Alberta, LL.B., 1989
Admitted1990, Alberta


•Law Society of Alberta
•Calgary Bar Association
•Canadian Bar Association
•International Bar Association
•Association of International Petroleum Negotiators
•Member of the Professional Responsibility Committee of the Law Society of Alberta, 2008 to present
•Former Member of the Law Society of Alberta Pro Bono Committee, 2007-2008
•Former Member of the Law Society of Alberta Civil Practice Advisory Committee, 2004-2007
•Executive Member of the National Aboriginal Law Section of the Canadian Bar Association
•Past Chair, Vice-Chair and Secretary-Treasurer of the Aboriginal Law Section (Southern Alberta) of the Canadian Bar Association
•Past Chair of the Constitutional Law Section (Southern Alberta) of the Canadian Bar Association


Heather L. Treacy, Q.C. is the Managing Partner of the firm's Calgary office. Heather is an experienced counsel whose practice is focused on civil litigation and dispute resolution.

She has over 23 years of experience in acting as counsel to clients in complex litigation and disputes, and has extensive experience with negotiations and mediation on matters related to energy and resources law, aboriginal and constitutional law, general commercial disputes, transportation, aviation, products liability, human rights, employment law and intellectual property law. She frequently appears before both the Trial and Appellate Courts in the Province of Alberta, the Federal Court of Canada, the Federal Court of Appeal and various tribunals, including the Canadian Human Rights Tribunal, energy related tribunals and the Canadian Transportation Agency.

Heather has extensive knowledge of the energy industry, particularly in the oil and gas sector. She has acted on numerous oil and gas disputes, including contract, lease, farm-out and operating agreement issues and royalty calculation disputes. Heather also has specific expertise in aboriginal law and provides advice on a significant number of issues involving treaty, aboriginal rights and aboriginal title issues; Metis issues; land and reserve issues; Indian Act matters; issues arising under the Indian Oil and Gas Act and regulatory regime; consultation and accommodation issues; issues North of 60, comprehensive and specific land claim agreements, impact benefit agreements, training and employment agreements, joint-venture agreements, legislative regimes and resource issues and First Nation governance matters.

Heather has been recognized as a pre-eminent lawyer in the area of aboriginal law by The Canadian Legal Lexpert Directory (2010 to 2015), Best Lawyers in Canada (2012 to 2016), a Litigation Star by Benchmark Canada (2014 and 2015), and as a Notable Practitioner by Chambers Global (2015), all guides to the leading law firms and practitioners in Canada.

Heather is active in the community and has a passion for the arts. She is the Vice-Chair of the Board of Directors and Chair of the Governance Committee of the Calgary Philharmonic Orchestra. Heather is a past member of the Board of Directors and Corporate Secretary of the Alberta Ballet Company, Theatre Junction and the Calgary Region Arts Foundation.


•Recognized as one of Canada's Most Powerful Women: Top 100, 2014
•Recognized by Benchmark Canada 2014-2015 as a Litigation Star
Best Lawyers in Canada (Aboriginal Law), 2012-2016
Canadian Legal Lexpert Directory (Aboriginal Law), 2010-2015
Chambers Canada (Aboriginal Law), 2016
Chambers Global (Aboriginal Law), 2015
The Legal 500 Canada (Dispute Resolution), 2016
•BV Distinguished Peer Review Rated by Martindale-Hubbell
•Received the distinction and recognition as Queen's Counsel in 2012
•Recipient of the 1996 Canadian Bar Association Young Lawyers Pro Bono Service Award


•Vice Chair, Board of Directors and Chair, Governance Committee of the Calgary Philharmonic Orchestra
•Past member, Board of Directors and Corporate Secretary of the Alberta Ballet Company
•Past member, Board of Directors of Theatre Junction
•Past member, Calgary Region Arts Foundation


•Acting as counsel for energy companies on claims involving royalty calculation issues (Stoney Tribal Council v Petro-Canada Ltd. et al).
•Acting as counsel for an international air carrier in proceedings before the Canadian Transportation Agency and the Federal Court of Appeal.
•Acted as counsel to a manufacturing company involving the protection of its trademark and intellectual property.
•Acted as counsel in successfully compelling that an election be held when cancelled by a First Nations government (Shotclose et al v Stoney First Nation et al).
•Acted as Chief Federal Negotiator for the Government of Canada in a treaty on Vancouver Island involving the B.C. treaty process for First Nations.
•Co-Counsel for Imperial Oil in its application for the Kearl Oil Sands Project before a Joint Review Panel established by the Alberta Energy and Utilities Board and Canadian Environmental Assessment Agency.
•Acted on trespass and royalty claims arising out of the production of oil and gas on reserve lands (Samson Indian Band et al v Imperial Oil et al).
•Acted as counsel for a financial institution involving an action to trace and recover funds based on allegations of bribery (Alberta Treasury Branches v. Leahy et al).
•Acted as counsel defending a manufacturer of helicopter parts in relation to a products liability claim.
•Acted as counsel in Federal Court to constitutional challenges to customary aboriginal laws (Letendre v Appeal Board of the Horse Lake First Nations; Ashley Paige Horseman v Horse Lake First Nation).
•Acted on injunctive relief and membership issues associated with a First Nation Community (Horseman v Horse Lake First Nation).
•Acted as counsel on a matter as to whether an immigrant who was “overqualified” for a position of employment was discriminated on the basis of national or ethnic origin (Sangha v McKenzie Valley Land and Water Board).
•Acted as counsel for an international air carrier in obtaining Anton Piller relief.
•Acted on issues associated with the specific land claim agreement of a First Nation Community (McAllister v. Horse Lake First Nation).
•Acted on determination of reserve interests under Indian Act (Stoney Band v. Poucette).


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Office Information

Heather L. Treacy, Q.C.

Suite 1000 - 250 2nd Street S.W.
CalgaryAB T2P 0C1

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