With more than 25 years of experience and deep expertise in intellectual property law, David S. Harper, Ph.D., counsels clients on patent preparation, prosecution and portfolio development. His practice comprises all phases of U.S. and foreign patent and trademark prosecution, licensing and other agreement work, counseling, due diligence analysis, infringement analysis, and invalidity analysis.

Dr. Harper works with a range of clients – including startups, large companies, universities and nonprofit institutions – to protect valuable technology. His has particular expertise in the areas of:

  • Biologicals
  • Pharmaceuticals
  • Diagnostics
  • Biochemistry
  • Cell biology
  • Immunology
  • Molecular biology
  • Medical devices

With a Ph.D. in molecular biology and a background in research, Dr. Harper’s unique experience allows him to better understand his clients’ innovative technologies.

  • J.D., Chicago-Kent College of Law,

    With High Honors, Order of the Coif


  • Ph.D., University of Illinois at Chicago,

    Molecular Biology;

    Postdoctoral research, Duke University, RNA-binding proteins and the abnormal proliferation of smooth muscle cells

  • B.S., Northern Illinois University,


Bar Admissions
  • Illinois
  • U.S. Patent & Trademark Office


  • Illinois Super Lawyers Rising Star


  • Developed and managed intellectual property portfolios for multiple startup clients, leading to successful licensing programs and subsequent acquisition by large companies.
  • Developed and managed IP portfolios for numerous early-stage drug development and diagnostics clients.
  • Developed and managed intellectual property portfolios in a wide range of technologies for a number of university clients, including multiple portfolios outlicensed to start-up, mid-size and Fortune 500 companies.
  • Counseled startup and early-stage clients on non-infringement, invalidity, patentability and freedom to operate opinions.