Who is McGeorge Bundy from Thirteen Days; a Memoir of the Cuban Missile Crisis and what is their importance?

The National Security Advisor in the Kennedy Administration, Bundy startles JFK on the morning of 16 Oct. 1962 with news of Soviet missiles in Cuba. Bundy initially favors the diplomatic approach, confronting Gromyko or Khrushchev with the evidence directly and demanding withdrawal; anything else requires suspending the rules of diplomacy and shortsightedly humiliating the USSR. If Khrushchev refuses, the Administration is shielded from criticism it has provoked a confrontation without first trying to negotiate. The argument is powerful but within a week, Bundy sides with the air strike advocates. He tries to stay in the minority and keep JFK's options open.