Brendan OCallaghan

Brendan O'Callaghan

Baker & McKenzie LLP


Brendan D. O'Callaghan is an associate in Washington, DC and a member of the North America Intellectual Property Practice Group. Prior to joining the Firm, he was a judicial law clerk to the Honorable Mary Ellen Coster Williams at the US Court of Federal Claims and served as a Surface Warfare Officer in the US Navy. He brings the pragmatic, mission-oriented mindset developed over multiple at-sea deployments to tackling clients' complex issues.

Practice Focus

Brendan represents clients in all phases of intellectual property matters, including at the International Trade Commission and the Patent Trial and Appeal Board as well as in federal court. Brendan has broad and deep IP experience, having litigated cases involving patents (both utility and design), trademarks, copyright, and trade secrets across a variety of technologies and industries. He has worked on matters involving software, pharmaceuticals, signals processing, semiconductors, high-tech machinery (such as jet engines), robotics, and satellite communications. He also counsels clients on various IP aspects of business decisions and transactions.

In addition to his IP practice, Brendan also focuses on international litigation concerning products imported into or exported from the United States, as well as unfair competition actions.

Brendan maintains a vibrant pro bono practice, having represented those in need of aid at all levels of the legal system. His pro bono appearances span federal and state trial courts, administrative agencies, and federal appellate courts, including the US Supreme Court. He most recently served as clemency counsel for an inmate on death row in Tennessee.

Professional Honors

  • Outstanding Achievement Award for Exceptional Commitment to Civil Rights and Justice, Washington Lawyers' Committee for Civil Rights & Urban Affairs, 2019

Professional Associations and Memberships

  • American Bar Association -- Steering Committee, Death Penalty Representation Project (2020-Present)
  • American Intellectual Property Law Association
  • International Trademark Association -- The Trademark Reporter Committee (2018-2019 term)
  • Copyright Society of the USA


  • New York~United States
  • District of Columbia~United States
  • U.S. Court of Appeals for Veterans Claims


  • George Washington University Law School (JD, with honors) (2016)
  • United States Naval Academy (BS Aerospace Engineering)


  • English