What is Robert C. O'Brien?
{{Infobox officeholder |name = Robert O'Brien |image = Robert O'Brien with President Trump in California (48759209323) (cropped).jpg |office = 27th [[United States National Security Advisor]] |status = |president = [[Donald Trump]] |term_start = September 18, 2019 |term_end = January 20, 2021 |predecessor = [[John R. Bolton]] |successor = [[Jake Sullivan]] |office1 = Special Presidential Envoy for Hostage Affairs |president1 = [[Donald Trump]] |term_start1 = May 25, 2018 |term_end1 = October 3, 2019 |predecessor1 = Position established |successor1 = Hugh Dugan |birth_date = {{birth date and age|1966|6|18}} |birth_place = [[Los Angeles]], [[California]], [[United States|U.S.]] |death_date = |death_place = |party = [[Republican Party (United States)|Republican]] |education = [[University of California, Los Angeles|University of California, Los<br/>Angeles]] ([[Bachelor of Arts|BA]])<br/>[[University of California, Berkeley|University of California,<br/>Berkeley]] ([[Juris Doctor|JD]]) }} '''Robert Charles O'Brien''' (born June 18, 1966) is an American lawyer and politician. He has worked privately and with the [[United States]] government. He was the 28th [[United States National Security Advisor]] from September 18, 2019 to January 20, 2021. He also is an ambassador with the U.S. Special Presidential Envoy for Hostage Affairs. He is a partner at Larson O'Brien LLP, a Los Angeles-based [[boutique law firm]].<ref>{{cite web|last1=Meyer|first1=Dani|title=11 Arent Fox Attorneys Decamp to Launch Litigation Boutique|url=http://www.law360.com/articles/747890/11-arent-fox-attys-decamp-to-launch-litigation-boutique|website=Law 360|publisher=Law 360|access-date=August 30, 2016}}</ref><ref name = state>{{cite web|title=Robert C. O'Brien|url=https://www.state.gov/r/pa/ei/biog/283437.htm|archive-url=https://web.archive.org/web/20180623103103/https://www.state.gov/r/pa/ei/biog/283437.htm|url-status=dead|archive-date=June 23, 2018|website=U.S. Department of