Robert C. O'Brien

Robert Charles O'Brien Jr. (born June 18, 1966) is an American attorney who served as the twenty-seventh United States national security advisor from 2019 to 2021. He was the fourth and final person to hold the position during the presidency of Donald Trump. He is currently the chairman of the American Global Strategies firm advising companies on international politics, the U.S. government, and crisis management.

Robert C. O'Brien
27th United States National Security Advisor
In office
September 18, 2019  January 20, 2021
PresidentDonald Trump
Deputy
Preceded byJohn Bolton
Succeeded byJake Sullivan
2nd Special Envoy for Hostage Affairs
In office
May 25, 2018  October 3, 2019
PresidentDonald Trump
Preceded byJames C. O'Brien
Succeeded byRoger D. Carstens
Personal details
Born
Robert Charles O'Brien Jr.

(1966-06-18) June 18, 1966
Los Angeles, California, U.S.
Political partyRepublican
SpouseLo-Mari O'Brien
Children3
EducationUniversity of California, Los Angeles (BA)
University of California, Berkeley (JD)
Military service
Allegiance United States
Branch/service
Rank Major
UnitJudge Advocate General's Corps
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