William Casey focuses his practice on transactional matters in the areas of intellectual property and privacy. He advises companies on a broad range of legal and business matters in connection with acquiring, selling, evaluating, licensing and protecting intellectual property assets.

Mr. Casey also has experience handling patent, trade secret and other intellectual property litigation, as well as complex civil matters.

His representative transactional matters include:

  • Cavium, Inc. in its $6 billion acquisition by Marvell Technology Group Ltd.;
  • Intel Corporation in its $15.3 billion acquisition of Mobileye, N.V.; and
  • Broadcom Corporation in its $37 billion sale to Avago Technologies Limited.

His representative litigation matters include:

  • ZeniMax Media, Inc. and id Software LLC in a successful enforcement of intellectual property rights resulting in a $500 million jury verdict;
  • SanDisk Corporation in a successful enforcement of a breach of patent license agreement resulting in a $28.5 million verdict;
  • Medtronic, Inc. as a defendant in a patent infringement suit in federal court and as petitioner in inter partes review proceedings involving endoluminal medical devices; and
  • Justice Robert M. Mallano, individually and on behalf of a class of more than 3,000 California judges, justices and judicial pensioners, in a successful declaratory judgment action relating to the underpayment of judicial salaries.

Prior to joining Skadden, Mr. Casey served as an extern to the Hon. Charles R. Breyer of the United States District Court for the Northern District of California. He also served as an extern at the United States Patent and Trademark Office. Prior to law school, he worked as an engineer for several life sciences companies.

Mr. Casey maintains an active pro bono practice and serves on the board of the nonprofit organization Science is Elementary.



  • University of California, Hastings College of the Law (J.D., 2013) (magna cum laude, Hastings Law Journal)
  • Keck Graduate Institute (M.B.S., 2006)
  • Rose-Hulman Institute of Technology (B.S., Mechanical Engineering, 2004)


  • California
  • U.S. Patent and Trademark Office


Judicial Extern, Hon. Charles R. Breyer, United States District Court for the Northern District of California

William J. Casey

Associate, Intellectual Property and Technology