Jillian R. O’Brien

Of Counsel || Portland (ME)

Jill O’Brien focuses on defense of ERISA claims and employment cases. She has extensive experience litigating complex and high-stakes civil matters. She has litigated numerous Ninth Circuit appeals and federal civil-rights cases. She has broad experience arguing before district and appellate courts and has defended multiple jury trials. Before joining Ogletree Deakins, she served as a deputy attorney general for the State of California for seven years. She also previously worked at a large international law firm, litigating trademark, patent, employment, and contract cases, and as a deputy public defender.

Learn more about Jillian R. O’Brien


  • J.D., University of Michigan Law School, 2007
  • B.A., Harvard College, 2002

Admittance to Practice

  • Maine
  • California
  • U.S. District Court, District of Maine
  • U.S. District Court, Central, Eastern, Northern and Southern Districts of California
  • U.S. Court of Appeals, First and Ninth Circuits
  • February 2011 - Gonzaga L. Rev. - "A Statistical Analysis of Trade Secret Litigation in State Courts"
  • March 2010 - Gonzaga L. Rev. - "A Statistical Analysis of Trade Secret Litigation in Federal Courts"
  • Judicial Clerk to the Hon. Anne C. Conway, United States District Court for the Middle District of Florida (2007-2008)

Insights by Jillian R. O’Brien