The CEO of the Bill & Melinda Gates Foundation has a message: Hey billionaires, give away more of your money to address inequality and do it soon. Mark Suzman made the call in his annual letter released Thursday that led with the story of Chuck Feeney, a billionaire whose philanthropy inspired Warren Buffett, Bill Gates and Melinda French-Gates. Feeney, who died in October, made a fortune through duty free stores and gave away $8 billion during his life, much of it anonymously.