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
•Institute of Corporate Directors
•Former Member of the Professional Responsibility Committee of the Law Society of Alberta, 2008 to 2014
•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 25 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 Litigation Star by Benchmark Canada (2014 and 2015), in Legal 500 Canada (2016) for dispute resolution, and 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), Chambers Global (2015) and Chambers Canada (2016), all guides to the leading law firms and practitioners in Canada. In 2014, Heather was recognized as one of Canada's Most Powerful Women: WXN Top 100.

Heather is active in the community and has a passion for the arts. She is the Chair of the Board of Directors 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 WXN, 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
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

Community Involvement

•Chair, Board of Directors and Past Vice-Chair 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


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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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