8. Henry Ford
Henry Ford was an American automotive engineer, entrepreneur, and founder of the Ford Motor Company. Through his designing of the Model T Ford and employing the assembly line means of rapid production, he was able to lower the base price of his product in order to reach a wider market. His highest earnings are recorded at age 57 and he died at the age of 83 in 1947 at a net worth of US$188.1 billion (Inflation adjusted value in 2008 dollars).