Alden Pyle is the "quiet American" of the title. Pyle is thoughtful, soft-spoken, intellectual, serious, and idealistic. He comes from a privileged East Coast background. His father is a renowned professor of underwater erosion who has appeared on the cover of Time magazine; his mother is well respected in their community. Pyle is a brilliant graduate of Harvard University. He has studied theories of government and society, and is particularly devoted to a scholar named York Harding. Harding's theory is that neither Communism nor colonialism is the answer in foreign lands like Vietnam, but rather a "Third Force", usually a combination of traditions, works best. Pyle has read Harding's numerous books many times and has adopted Harding's thinking as his own. Pyle also strives to be a member of this "Third Force". The Pyle character is partly modelled on US military counter-insurgency expert Edward Lansdale, who was stationed in Vietnam 1953-1957.[3]
Phuong, Fowler’s lover at the beginning of the novel, is a beautiful young Vietnamese woman who stays with him for security and protection, and leaves him for the same reason. She is viewed by Fowler as a lover to be taken for granted and by Pyle as a delicate flower to be protected, but Greene never makes clear which, if either, of these views is actually the truth. Pyle's desire for Phuong was