Who is William Harrison from Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time and what is their importance?

William Harrison was John's son and right-hand man. He was not the clock-making genius that his father was, but he did work hard to help his father build and test H-3, H-4, and H-5. William also functioned as his father's advocate before various groups with whom they hoped to ally themselves.