The Top 10 World's Richest Entrepreneurs

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6. Michael Bloomberg - $33 billion

Former New York City mayor Michael Bloomberg may not be at the helm of the Big Apple any longer, but the entrepreneur still holds ample sway in both business and political circles. Just last week, he was in Washington, D.C. to help usher in President Obama's My Brother's Keeper program, an initiative focused on men of color, which is modeled after the former mayor's program in New York. Before working at city hall, the world's 16th-richest person, who has a fortune valued at $33 billion, held court at his eponymous financial software and media firm Bloomberg LP.