Mo Ibrahim $1.1 billion
Sudanese-born Mo Ibrahim founded mobile phone company Celtel and sold it off in 2005 for $3.4 billion, pocketing $1.4 billion. He now devotes his energy and resources to philanthropy and investing in Africa. In 2007 he created the Mo Ibrahim Foundation to promote good governance in Africa. The foundation awards the Mo Ibrahim Prize for Achievement in African Leadership which gives $5 million to African heads of state who have delivered on the dividends of good democratic governance. The foundation failed to identify a worthy recipient for the award in 2009, 2010 and 2012. His daughter, Hadeel, runs the foundation.