Herbert Raymond "H. R." McMaster (born July 24, 1962) is a United States Army officer. In 2017, he became the 26th National Security Advisor, serving under President Donald Trump. He is also known for his roles in the Gulf War, Operation Enduring Freedom, and Operation Iraqi Freedom.
Born in Philadelphia, McMaster graduated from the United States Military Academy in 1984, and later earned Ph.D. in American history from the University of North Carolina at Chapel Hill. His Ph.D. thesis was critical of American strategy and military leadership during the Vietnam War and served as the basis for his book, Dereliction of Duty, which was widely read in the United States military. During the Gulf War, McMaster served as a captain in the 2nd Cavalry Regiment, taking part in the Battle of 73 Easting.
After the Gulf War, McMaster served as a military history professor at the United States Military Academy and held a series of staff positions in the United States Central Command. In 2004, he took command of the 3rd Cavalry Regiment and fought the Iraqi insurgency in Tal Afar. He became a top counter-insurgency adviser to General David Petraeus before serving as the Director of the Army Capabilities Integration Center. He also served as the Deputy to the Commander for Planning of the International Security Assistance Force in Afghanistan and, in 2012, he became Deputy Commanding General of the Army Training and Doctrine Command.
In February 2017, McMaster succeeded Michael Flynn as President Trump's National Security Adviser. He remains on active duty as a Lieutenant General of the United States Army.
According to wikipedia