At the center of Mountains Beyond Mountains stands Paul Farmer. Doctor, Harvard professor, renowned infectious-disease specialist, anthropologist, the recipient of a MacArthur "genius" grant, world-class Robin Hood, Farmer was brought up in a bus and on a boat, and in medical school found his life’s calling: to diagnose and cure infectious diseases and to bring the lifesaving tools of modern medicine to those who need them most.

Mountains Beyond Mountains takes us from Harvard to Haiti, Peru, Cuba, and Russia as Farmer changes minds and practices through his dedication to the philosophy that "the only real nation is humanity"—a philosophy that is embodied in the small public charity he founded, Partners in Health. He enlists the help of the Gates Foundation, George Soros, the U.N.’s World Health Organization, and others in his quest to cure the world.

At the heart of this book is the example of a life based on hope, and on an understanding of the truth of the Haitian proverb "Beyond mountains there are mountains": as you solve one problem, another problem presents itself, and so you go on and try to solve that one too.