Who is Robert F. Kennedy from Thirteen Days; a Memoir of the Cuban Missile Crisis and what is their importance?

The U.S. Attorney General in the Kennedy Administration, RFK is the President's younger brother and closest confidant, having worked for him politically since 1953. RFK writes as the premier insider, revealing conversations they alone share. He writes respectfully of others, including generals whose opinion appall both him and JFK, and skims over the Vietnam War, which causes a break between himself and JFK's successor, Lyndon B. Johnson. After the disastrous Bay of Pigs invasion, JFK makes no foreign policy decisions without input from RFK and Ted Sorensen. Thirteen Days is very much a "profile in courage" of the late president, emphasizing how JFK seeks advice from people whose wisdom he respects but whose job descriptions might not seem relevant; people who ask difficult questions, make him defend his position, present different points of view, and are skeptical.