Attorney General Jeff Sessions appointed Patrick S. O’Brien to begin hearing cases in August 2017. Judge O’Brien earned a Bachelor of Science degree in 1995 from California Polytechnic State University, San Luis Obispo and a Juris Doctor in 2000 from University of California, Hastings College of the Law. From 2009 to 2017, he served as an assistant chief counsel for the Office of Chief Counsel, Immigration and Customs Enforcement, Department of Homeland Security, in San Francisco. From 2001 to 2017, he worked for the U.S. Army Judge Advocate General’s Corp, entering as a student in 2001; serving as a legal assistance attorney in Korea, 2002 to 2003; trial counsel in Fort Lewis, Wash., and Iraq, 2003 to 2004; as trial defense counsel in Fort Lewis and Afghanistan, 2004 to 2007; special assistant U.S. attorney in Fort Lewis, 2007 to 2008; senior defense counsel, U.S. Army Reserve, 2009 to 2014; a brigade judge advocate, U.S. Army Reserve, 2014 to 2016; and currently as an adjunct professor of international and operational law. Judge O’Brien is a member of the California State Bar.