John D. Rockefeller
His very name is synonymous with wealth and success. This oil mogul never even completed high school, but you never could have known it by the clever way he managed his money and his monster business, Standard Oil. The company was so rapidly successful that the United States had to step in and literally break it up so that it did not begin to monopolize the oil industry. Rockefeller may have had humble beginnings, but he is still believed to be one of the richest men in history.
Steven Spielberg
Probably known as one of the best movie directors of all time, Spielberg dropped out of California State University in hopes of getting into film school, where he was also denied admission. Although he had a rocky start, Spielberg eventually went on to found DreamWorks Movie Studios which has produced some of the biggest grossing movies of all time. He is estimated to be worth $3 billion dollars.