The 60 year-old media mogul is the only real African-American billionaire on the planet with a net worth estimated at $3 billion. Winfrey hit the big style through her flagship daytime TV show which aired for 25 years between 1986 and 2011, before she bowed out to channel her energies to her own cable network, OWN. The once-struggling network became cash-flow positive in 2013. Winfrey was element of a consortium of billionaires that included Oracle CEO Larry Ellison and billionaire media executive David Geffen who bid for LA Clippers basketball team but lost to former Microsoft CEO Steve Ballmer. One of many world's most generous women, she's given millions to educational causes across the entire world, one of them being the $100 million she's allocated to the Oprah Winfrey Leadership Academy for Girls in South Africa.
