Age: 43

Font of financial data: Bloomberg L.P. is a global source of financial information, news and analytics. It provides financial and market data, pricing, trading and communications tools. The company’s holdings include television and radio stations. Bloomberg’s target markets include corporations, news organizations, financial professionals, lawyers and private individuals worldwide. The company was founded in 1981 by Michael R. Bloomberg, who stepped down as chairman of the company before his election as the mayor of New York City in 2001. Corporate headquarters are in New York, where Bloomberg employs approximately 5,000 people, with an additional 5,000 employees scattered around the world. The privately held firm does not divulge revenue figures.