The Wealthiest American Dynasties, Ranked

Michael Bloomberg, founder of the financial data giant Bloomberg LP, is a titan of business and a three-term mayor who reshaped New York City. Known for his technocratic style and philanthropic reach, Bloomberg balanced Wall Street savvy with public service.

His $53 billion fortune stems mainly from his privately held media and software empire, serving financial professionals around the globe. He shares his life with longtime partner Diana Taylor off the public stage. His daughters, Georgina and Emma, made the headlines, notably appearing in the 2003 documentary Born Rich.