Madelaine Thomas is an associate in the Intellectual Property group of Mayer Brown’s Chicago office. She has a broad range of experience encompassing litigation in federal and state court, transactional work, and matters before the United States Patent and Trademark Office (USPTO). Madelaine’s practice includes intellectual property litigation (trademark, copyright, and trade secret); trademark prosecution, enforcement, and counseling; and investigation of counterfeit and infringing matters.


  • Managing the global trademark portfolio and brand protection strategy for a large Fortune 500 company, including drafting trademark clearance opinions, filing, prosecuting and maintaining U.S. marks.
  • Advise clients regarding the purchase and sale of Intellectual Property assets.
  • Advise clients regarding the likelihood of success in prosecuting enforcement actions before the U.S. Trademark and Trial and Appeal Board and U.S. Federal Courts; prosecute and defend infringement claims in U.S. Federal Courts, and opposition and cancellation proceedings before the TTAB.


DePaul University College of Law, JD, cum laude

Editor-In-Chief, DePaul Journal of Art, Technology, and Intellectual Property Law; President, DePaul Art and Cultural Heritage Law Society

Queen's University, BA, with honors, Art History


  • Illinois