Mark Cuban had trouble holding down a job before he started his own successful business.
Elon Musk was fired from his role as CEO of PayPal in 2000, but has since created SpaceX and Tesla and become a billionaire.
When Meg Whitman took the role of eBay CEO in 1998, she helped propel the company through acquisitions while keeping the culture alive.
Even though Warren Buffett has said that buying Berkshire Hathaway was "the dumbest stock I ever bought," he turned the company into a conglomerate with over 90 subsidiaries.
In 1998, Jamie Dimon was forced out of his role as president of Citigroup. By 2005 he was the CEO of JPMorgan Chase.