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Mary Comeau

Senior Partner

Mary Comeau


T:+1 403.267.8156

Mary Comeau practises in the area of dispute resolution, focusing on corporate-commercial and securities law, oil and gas, and electricity.

Ms. Comeau has appeared in all levels of courts in Alberta and before the Federal Court of Canada and the Supreme Court of Canada. She regularly acts as counsel in complex commercial arbitrations and mediations locally and internationally. She is Calgary chair of our litigation group and currently a director of the ADR Institute of Canada, Inc. and the Canadian Branch of the International Centre for Dispute Resolution.

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  • Education

    LL.B., University of Calgary, 1989
    B.S.W., University of Calgary, 1986

  • Representative experience


    Ms. Comeau has acted recently for the following clients:

    • The federal Crown in the Federal Court of Canada in an action brought by four Indian bands claiming damages in excess of $1 billion, focusing on oil- and gas-related claims
    • Clients in numerous arbitrations related to power purchase arrangements
    • An oil and gas company in a dispute regarding heavy oil production
    • Numerous oil and gas companies in matters related to aboriginal consultation and project development
    • Clients in numerous domestic and international arbitrations regarding general commercial matters, power purchase arrangements and gas price disputes
    • Major oil and gas companies in all matter of disputes including oil and gas, joint venture, gas processing and marketing disputes
    • Corporate clients with respect to reorganizations and plans of arrangement pursuant to the Canada and Alberta Business Corporations Acts
    • An accounting firm in major litigation relating to losses arising out of a foreign exchange hedging program
    • Several mining companies in disputes related to the staking of lands in the Northwest Territories and environmental issues relating to the development of a diamond mine
    • Clients in numerous private and court-facilitated mediations with respect to various commercial matters


  • Admissions
    • Alberta 1990
  • Rankings and recognitions
    • Chambers Canada, Alberta: Litigation - General Commercial, Chambers and Partners, 2018
    • Canadian Legal Lexpert Directory, (2014-2017): recommended in Litigation - Corporate
    • Best Lawyers in Canada (2011-2017): International Arbitration
    • Best Lawyers in Canada (2013-2016): Corporate and Commercial Litigation
    • Benchmark Canada (2014-2016): Top 25 Women in Litigation (Canada)
    • Commercial Arbitration Expert Guide (2015-2017): recognized as a world leading expert in Commercial Arbitration
    • Chambers Global: Canada (2010-2017): Dispute Resolution: Alberta
    • Benchmark Canada (2013): recognized as a local litigation star in Alberta – Alberta Female Litigator of the Year; Litigation star in Canada in Energy and Natural Resources, Aboriginal and Arbitration
    • Benchmark Canada (2012): recognized as a “Litigation Star” in the areas of Commercial Litigation, Energy Litigation, Securities
    • Recognized for achievement in legal research and writing by the Centre for International Legal Studies (2010)
  • Publications
    Top Five Tips for Drafting Arbitration Agreements, ADR Perspectives, Vol. 3, No. 2, September, 2016
  • Speaking engagements
    • "Hot Topics in Commercial Arbitration", panelist, 11th Annual Western Canada Commercial Arbitration Society (WCCAS) Energy, Mining and Resources Arbitration Conference, Calgary, May 9, 2017.
    • “Party Dynamics Affecting Arbitration Advocacy and Ethics and Professionalism in Arbitration Advocacy,” panelist, The Advocates Society, November 3, 2016, Calgary.
    • “Promoting Better Access to Justice,” panelist, Global Pound Conference, October 15, 2016, Toronto.
    • “Appointments Under the ADRIC Rules,” ADRIC 2016 Annual Conference, October 13-14, 2016, Toronto.
    • “Controlling Costs in Arbitration” (panel moderator), YCAP Spring 2016 Symposium, Calgary. 
    • “Res Judicata and Issue Estoppel in Arbitration,” 10th Annual WCCAS Energy, Mining and Resources Arbitration Conference, Calgary,  May 10, 2016. 
    • “Don’t Get Killed by the Drop Dead Rule,” Legal Education Society of Alberta, Calgary/Edmonton, April 2012.
    • “Insider Training - Arbitration,” in-house presentation, Calgary, 2012-2017.
    • “Arbitration of Natural Resource Development Disputes,” ICC Asia Pacific Conference 2012, San Francisco, March 2012.
    • “Power Purchase Arrangements: Handling Issues Unique to PPA Disputes,” inSIGHT - 9th Edition Energy Contracts, Calgary, March 2012.
    • “Arbitration” (faculty), Legal Education Society of Alberta, October 2011.
  • Memberships and activities


    • ADR Institute of Alberta
    • ADR Institute of Canada
      • Board of Directors
    • Canadian Bar Association
    • Law Society of Alberta
    • Calgary Bar Association
    • Chartered Institute of Arbitrators (United Kingdom)
    • International Bar Association
    • Guest Lecturer, University of Calgary Trial Advocacy Course
    • Director, WCCAS
    • Secretary ,  Executive Board of Theatre Calgary
    • Director, St. Mary's University