think in a couple of people:

Sam Walton: he went from milking his family’s families cows to serve in WW2 to owning a five and dime to becoming a billionaire and changing the retail industry

Oprah Winfrey: changed daytime TV and became a billionaire

Jeff Bezos: started selling books and changed the retail industry all over again and he is one of the richest people on the face of the earth