Net Worth $17 billion
This nephew of the Saudi king is one of the world’s wealthiest investors, with a big stake in Citigroup. Received much publicity–some of it negative–in December 2005 for the $20 million gifts he made to Harvard and Georgetown to expand their Islamic studies departments. In January 2006, with a partner, announced a $3.9 billion deal to buy Fairmont Hotel & Resorts. In February listed his hotel holdings on the Dubai stock exchange. Planning to take his main investment group, Kingdom Holdings, public on the Saudi exchange later this year.