Some famous American billionaires became rich from technological ventures, such as Bill Gates and Mark Zuckerberg. Other U.S. billionaires made their fortune in the financial sector, including Warren Buffett and Michael Bloomberg.
Bill Gates is most famous for founding Microsoft, and he is also famous for his philanthropy. As of 2015, Gates' net worth is $79 billion. Mark Zuckerberg is most famous for founding the social media site Facebook. As of 2015, Zuckerberg's net worth is $42.3 billion.
Warren Buffett is famous for his investment company, Berkshire Hathaway. Buffett's net worth is $67.2 billion as of 2015. Michael Bloomberg is famous for his stint as mayor of New York City, but his net worth of $37.8 billion primarily comes from his self-titled media company.