An entrepreneurial and engineering genius, Leroy Hill left his mark on 20th century aviation. But that was just the beginning.As a gifted Berkeley engineering graduate in the late teens, Hill succeeded in reengineering the famous "Liberty Engine" of World War I to fit into the legendary fighter DH-4, or "Flying Coffin." In the late 1920s his passion for aviation brought him to a new marketplace as twelve-year president of Air Associates--that remarkable...