5 billionaires who won't leave their fortunes to their kids Michael Bloomberg, American businessman and politician Bloomberg wrote in a letter to The Giving Pledge. Gina Rinehart, Australian mining magnate
she once claimed in court papers. Bill Gates, co-founder of Microsoft he told The Sun in 2010. Warren Buffet, CEO of Berkshire Hathaway Buffett said in a letter to the Gates Foundation. Pierre Omidyar, founder of eBay Omidyar said in a letter to the Gates Foundation.