Formerly married to Amazon (AMZN) 's Jeff Bezos, Scott has been on a philanthropic spree in the past few years. In total, her foundation has given out more than $16.5 billion to nearly 2,000 nonprofits. As a signee of the Giving Pledge, a philanthropic campaign started by Bill Gates, Melinda French Gates and Warren Buffett, Scott has pledged to give away the majority of her $41.1 billion fortune.