Henry Ford was a farm boy who went on to revolutionize transportation industry in America. Ford was very interested in mechanics from a young age, when he dismantled and reassembled a pocket watch at the age of 15 his father had given him. A self-taught watch repairman who graduated to being an apprentice machinist, Ford started his personal experiments on gasoline engines which was the beginning of his vast Ford empire. And his net worth, as per Forbes in 2008, is a cool $188.1 billion.