A partner in Armstrong Teasdale’s Litigation practice group, Mark Halderman has broad experience in a number of areas, including intellectual property litigation, real estate and land use disputes, and matters arising under the Racketeer Influenced and Corrupt Organizations Act, Title VI and the Individuals with Disabilities Education Act.

In the field of intellectual property litigation, Mark’s experience covers all practice areas, with an emphasis on patent litigation. He represents both patentees and accused infringers in various fields of technology. He also has substantial experience in trademark, trade secret and copyright matters.


Prior to joining the firm, Mark was a partner at another Philadelphia law firm.


  • Penn State University Dickinson School of Law  (J.D., 2009)
  • Lafayette College  (B.A., 2005)


  • Pennsylvania
  • Texas
  • U.S. District Court, Eastern District of Pennsylvania
  • U.S. District Court, Eastern District of Texas

Professional Activities

  • American Bar Association
  • American Intellectual Property Law Association

Charitable and Civic Involvement

  • Planning Commissioner for Wrightstown Township, Pennsylvania