Greg Israelsen focuses his practice on complex intellectual property matters, with an emphasis on post-grant proceedings, patent litigation and patent counseling. His experience includes representing clients in inter partes review proceedings and ex parte reexamination, as well as assisting clients procure domestic and foreign patents, providing counseling, and advising on infringement matters. Mr. Israelsen has worked on patent matters in a wide variety of technology areas, including software, telecommunications, networking, remote computing, cloud computing, virtualization, printers, label makers, industrial Internet of Things, medical devices, business methods, finance and insurance.

Before joining WilmerHale, Mr. Israelsen was a partner at another law firm in Washington DC, where he represented clients before the United States Patent and Trademark Office in post-grant proceedings and in prosecuting patent applications. He also prepared freedom-to-operate and patentability analyses and invalidity opinions. 


  • Contributor, Federal Circuit finds disparaging marks registrable – analysis and reaction, WORLD TRADEMARK REVIEW (Mar. 2016).
  • Contributor, Legal Guide to Video Game Development, Second Edition, ABA BOOK PUBLISHING (2016).
  • Supreme Court Report: Supreme Court Hears Oral Arguments in B&B Hardware, Inc. v. Hargis Industries, Inc., IP LITIGATOR (Feb. 2015).
  • The D.C. Circuit’s EPIC Failure in Electronic Privacy Information Center v. U.S. Dept. Homeland Sec., 78 J. AIR L. & COM. 711 (2013).
  • Applying the Fourth Amendment’s National-Security Exception to Airport Security and the TSA, 78 J. AIR L. & COM. 501 (2013).
  • Note, Searching for a Trademarks Test: The Ninth Circuit’s Query in Network Automation, 2012 BYU L. REV. 525 (2012).

Professional Activities

Mr. Israelsen is a member of the American Intellectual Property Law Association and the American Bar Association.


  • Recognized as a Rising Star for intellectual property in the 2020–2024 editions of Washington DC Super Lawyers
  • Selected as a Rising Star in Managing IP’s 2018–2020 lists of Rising Stars

Insights & News


  • Education

    • JD, Brigham Young University, J. Reuben Clark Law School, 2013

      cum laude

      John S. Welch Award for Outstanding Legal Writing

      Faculty Award for Meritorious Achievement and Distinguished Service

    • BS, Electrical Engineering, Brigham Young University, 2009

      with honors
  • Admissions

    • District of Columbia

    • Illinois

    • US Court of Appeals for the Federal Circuit

    • US Patent and Trademark Office

    • US Supreme Court



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