Author Tracy Kidder has made his name by writing about ordinary people's lives and finding drama where few others would think to look. He established himself with "The Soul of a New Machine," a book detailing the human interactions behind the rush to create a new computer. It won Kidder both the Pulitzer Prize and the National Book Award, and has since become the definitive book about the technology industry. He's also written about building a home, school children, a nursing home and the town of Northhampton, Massachusetts. Kidder's latest work, however, details the extraordinary. "Mountains Beyond Mountains" tells the story of Dr. Paul Farmer, an infectious-disease specialist and anthropologist who's made caring for the world's poorest and sickest his life's work. Kidder followed him to Peru, Cuba, Siberia and Haiti, chronicling his tireless efforts to bring medicine to those most in need.