Heather L. Treacy, Q.C. is a highly sought after and nationally recognized 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 and has been involved in several precedent setting cases.

Heather has been recognized as a Litigation Star by Benchmark Canada (2014 to 2019), and Acritas Star Lawyer (2019), in Chambers Canada for General Commercial Litigation – Alberta (2018-2019), in Legal 500 Canada (2016 to 2019) for dispute resolution, by Euromoney (2016) for Litigation and Product Liability, and as a pre-eminent lawyer in the area of aboriginal law by The Canadian Legal Lexpert Directory (2010 to 2019), Best Lawyers in Canada (2012 to 2019), Chambers Global (2015) and Chambers Canada (2016-2019), 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. In 2016, Heather received the WILL Award for "Leadership in the Profession in Private Practice". In 2017, she was named a winner of the Lexpert Zenith Awards: Celebrating Women in Law. 

Heather is active in the community and has a passion for the arts. She is the former Chair of the Board of Directors of the Calgary Philharmonic Orchestra. She is a member of the Board of Directors of the University of Calgary Alumni Association.