George F. Kennan
Past directors include George F. Kennan, Anne-Marie Slaughter, Jake Sullivan, Dennis Ross, Gregory B. Craig, Paul Wolfowitz, Paul Nitze, and Richard Haass, and past members include Zbigniew Brzezinski, Sandy Berger, Kori Schake, Michael Armacost, and Peter Berkowitz. At least 14 past members of the Policy Planning Staff have served as Ambassadors.