Mark A. Williamson

Williamson Mark
Mark Williamson has extensive experience in both patent procurement and client counseling in the electrical and mechanical arts, having procured more than 2000 patents. Mark counsels clients regarding worldwide portfolio management and strategic development, licensing, and enforcement. He has been very successful in appeals before the U.S. Patent and Trademark Office’s Patent Trial and Appeal Board and has been involved or counselled in various reexaminations, reissues, interferences, ITC proceedings, and post-grant reviews.  He has worked in a variety of technologies, including ink jet and laser printing, photocopying, medical devices, turbochargers, and  HVAC systems.

Before joining Venable, Mark spent his entire private practice career at Fitzpatrick, Cella, Harper & Scinto.


Government Experience

  • Examiner, U.S. Patent and Trademark Office

Representative Clients

  • Canon
  • Munters
  • Honeywell
  • Garrett Motion
  • DoseSmart




  • J.D. Georgetown University Law Center 1990
  • B.S. Mechanical Engineering Drexel University 1985

Bar Admissions

  • District of Columbia
  • Pennsylvania
  • U.S. Patent and Trademark Office

Professional Memberships and Activities

  • Past co-chair, Steering Committee, IP Law Community Section, DC Bar
  • Member, AIPLA


  • Managing Intellectual Property, IP Star, 2013 – 2020, 2022 – 2023


Pro Bono

  • Represented veterans in appeals of service-related benefits before the Court of Appeals for Veterans Claims