What is the author's perspective in the nonfiction book, Most Dangerous?

The book is written in the third-person perspective and the narrative includes the chronology of the events leading up to Daniel Ellsberg’s decision that it was worth his personal risk and freedom to let the American public know how the war was really going. While Sheinkin presents Ellsberg’s motivation for leaking the top secret document to the news media, he humanizes President Johnson and Secretary of Defense Robert McNamara the two men who made the decisions that escalated and prolonged the war. He describes an agonized Johnson as literally walking the halls of the White House at night over the decisions he made and had to make. McNamara’s position changed on the war and he nearly had a nervous breakdown over his role in the escalation of the war.