An associate in the firm’s Intellectual Property practice group, Karl Fisher represents clients in patent and other intellectual property litigation, as well as in general litigation matters. Karl has experience handling complex litigation cases and negotiating pre-litigation claims on behalf of his clients. He advocates for clients across industries including intellectual property rights holders, design and engineering professionals, product manufacturers, construction contractors, transportation companies, premises owners, and oil and gas companies. Leveraging his background as an architectural designer, Karl’s ability to visualize, distill and articulate both conceptual and technical data imparts a unique perspective to his representation.

As a former architectural designer and construction project manager, Karl brings unique experience to each representation, and has deep knowledge related to construction defects and contract disputes. He also possesses experience collaboratively managing all aspects of complex commercial litigation including matters involving regulatory investigations and admiralty matters.

Further, Karl has experience in defense matters involving Federal Motor Carrier Safety Administration litigation, toxic tort, premises liability, product liability, professional liability and medical malpractice both at trial and via alternative dispute resolution. He has handled a variety of corporate law matters, subrogation claims, creditors’ rights and employment matters as well.


Prior to joining Armstrong Teasdale, Karl worked in private practice for other law firms in Boston and Dallas.

Before law school, Karl worked as an architectural designer and construction project manager for projects throughout North Texas, providing design expertise for unique restaurant concepts to large scale, mixed-use developments.


  • University of Oklahoma College of Law  (J.D., 2015)
    • Dean's List
    • Teaching Assistant for International Business Transactions
  • Texas A&M University School of Architecture  (B.Arch., cum laude, 2007)
    • Environmental Design
  • Fundacio Politecnica de Catalunya  (2005)
    • International Study
    • Foreign Study of Urban Density and Public Space


  • Massachusetts
  • Texas
  • U.S. District Court, District of Massachusetts
  • U.S. District Court, Northern District of Texas

Professional Activities

  • Boston Bar Association
  • American Bar Association
  • Claims and Litigation Management Alliance
  • Workplace Ally

Charitable and Civic Involvement

  • Volunteer Income Tax Assistance (Tax Preparer)
  • Boy Scouts of America, Eagle Scout
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