David T. Madsen

David T. Madsen QC, FCIArb.


Executive Summary

David Madsen is a partner in our Corporate Commercial Litigation Group in our Calgary office, and a member of BLG's Partnership Board, which is our Firm's governing body​. David practises in all areas of commercial litigation. In particular, he has extensive experience representing Canadian and international clientele in litigation and alternative dispute resolution involving:

  • all sectors of the oil & gas industry;
  • electricity generation;
  • cybersecurity;
  • intellectual property including patent, trademark, copyright, software piracy, and the misappropriation of confidential information and technology;
  • class actions defence;
  • shareholders’ rights;
  • mergers & acquisitions, including hostile take-over bids, Plans of Arrangement, and dissent valuation proceedings;
  • insolvency and banking litigation;
  • fraud and fidelity-related actions;
  • Anton Piller Orders and Mareva Injunctions; and
  • land-related claims.

David has dealt with matters in all courts in Alberta, including the Alberta Court of Appeal; courts in British Columbia, Saskatchewan, Ontario and Newfoundland; the Supreme Court of Canada; and the Federal Court of Canada. He has also dealt with matters in the Alberta Securities Commission, and Canadian and International Arbitrations.

Representative Work

  • Representing an international oilfield services companies in relation to intellectual property claims including a claim for $500,000,000.00 with concurrent proceedings in Canada, the US, and Europe.
  • Representing international oilfield services companies in relation to fraud in Canada, the US, India, and Southeast Asia.
  • Representing a Canadian chartered bank in relation to several class actions.
  • Representing international satellite television service providers in combating theft of services and “hacking” by organized crime syndicates, including the execution of numerous Anton Piller Orders and Mareva Injunctions.
  • Representing numerous public companies in hostile take-over bid litigation including “poison pills” and dissent valuation proceedings.
  • Representing numerous Canadian chartered banks, national and international corporations, and other lending institutions in security enforcement proceedings, including CCAA, receivership and bankruptcy matters, large-scale agricultural-related work-outs and foreclosure litigation.
  • Representing electrical power generating companies in arbitration proceedings concerning their Power Purchase Arrangements.
  • Representing various clients in disputes relating to the US, Mexico, Venezuela, Colombia, Argentina, Australia, Indonesia, India, Syria, Germany, Denmark, Norway, and the United Kingdom.

Rankings & Recognitions

  • Recognized in the 2020 edition of Chambers Canada - Canada's Leading Lawyers for Business (Litigation: General Commercial - Alberta (Band 4)). 
  • Recognized in the 2020 (and since 2015) edition of Best Lawyers in Canada (Class Action Litigation and Corporate and Commercial Litigation).
  • Recognized in the 2019, 2017 (and since 2015) editions of Benchmark Canada – The Definitive Guide to Canada’s Leading Litigation Firms and Attorneys as a "Litigation Star: Arbitration, Class Actions, Commercial, Intellectual Property, Securities​."
  • Recognized as the Intellectual Property Litigator of the Year by the 2018 Benchmark Canada Awards.
  • Recognized in the 2015 edition of Benchmark Canada – The Definitive Guide to Canada’s Leading Litigation Firms and Attorneys as a "Local Litigation Star: Alberta" and "Litigation Star: General Commercial and Aboriginal."
  • Martindale-Hubbell® BV® Distinguished™ 4.4 out of 5 Peer Review Rated.