David Madsen

KC, FCIarb

Partner

Calgary
DMadsen@blg.com
403.232.9612
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David practices in all areas of commercial litigation, in particular representing Canadian and international clients in litigation and alternative dispute resolution.

His practice focuses on:

  • all sectors of the oil and gas industry
  • electricity generation
  • cybersecurity
  • intellectual property including patent, trademark, copyright, software piracy, and the misappropriation of confidential information and technology
  • class actions defense
  • shareholders’ rights
  • mergers and 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
  • 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.

Experience

  • Representing Weatherford International, an international oilfield services company, in the largest and most complex intellectual property (non-pharma) litigation in Canada recent years.
  • Representing Precision Drilling Corp., an international oilfield services company, in intellectual property claims including a claim for $500 million with concurrent proceedings in Canada, the U.S. and Europe.
  • Representing international oilfield services companies in relation to fraud in Canada, the U.S., India and Southeast Asia.

Beyond Our Walls

Professional Involvement

  • Member, Canadian Bar Association (CBA) - Intellectual Property Section, Civil Litigation Section, Insolvency Subsection
  • Member, Alberta Mortgage Loans Association
  • Member, International Anti-Counterfeiting Coalition
  • Lecturer, Continuing Legal Education Society of Alberta

Community Involvement

  • Extensive involvement with Calgary Minor Basketball and Calgary Minor Soccer
  • Volunteer with Canadian Cancer Society, Heart & Stroke Fund, Nothing But Nets, BLG Reads to Kids Program, Pro Bono Law
  • (Past) President, Lindsay Park Sports Society Board of Directors, Talisman Centre

Awards & Recognition

  • Recognized in the 2025 (and since 2015) edition of The Best Lawyers in Canada® (Class Action Litigation and Corporate and Commercial Litigation)
  • Recognized in the 2025 (and since 2020) edition of Chambers Canada - Canada's Leading Lawyers for Business (Litigation: General Commercial - Alberta).
  • Recognized in the 2025 and 2022 editions of The Canadian Legal Lexpert Directory (Litigation - Corporate Commercial)
  • Recognized in the 2025 edition (and since 2015) 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 in the 2022 edition of Lexpert Special Edition: Energy
  • Recognized as the Intellectual Property Litigator of the Year by the 2018 Benchmark Canada Awards.

Bar Admission & Education

  • Alberta, 1988
  • LLB (with Distinction), University of Saskatchewan, 1987
  • BA (with Distinction), University of Saskatchewan, 1985