H.R. McMaster is a retired U.S. Army lieutenant general, author, and academic renowned for his expertise in military history and national security. Born on July 24, 1962, he graduated from the United States Military Academy at West Point and later earned a Ph.D. in American history from the University of North Carolina at Chapel Hill. McMaster gained prominence with his book "Dereliction of Duty," a critical analysis of U.S. military leadership during the Vietnam War. He served as the 26th National Security Advisor to President Donald Trump, contributing his extensive knowledge to shaping U.S. foreign policy.