

According to Forbes, Bill Gates, the co-founder and chairman of Microsoft, is the wealthiest man in the United States with a net worth of $59 billion. Born to an upper middle class family in Seattle, Mr. Gates took an interest in computer programming in the 8th grade. Steven Senne/AP/File
Warren Buffet, whose net worth is $39 billion, said in August regarding taxing the wealthy, 'My friends and I have been coddled long enough by a billionaire-friendly Congress. It's time for our government to get serious about shared sacrifice.' Mr. Buffet is the chief executive officer of Berkshire Hathaway Inc., an American conglomerate holding company headquartered in Omaha, Neb. Mario Anzuoni/Reuters/Reuters
With a net worth of $33 billion, Larry Ellison is a licensed pilot and avid tennis player. He also is co-founder and chief executive officer of Oracle Corporation, a major enterprise software company. Born in Bronx, N.Y., Mr. Ellison was raised by his maternal aunt and uncle in Chicago. Ellison owns many properties in California, and in 2010 he purchased the Astor's Beechwood Mansion in Newport, R.I., for $10.5 million. Paul Sakuma/AP/File
Charles Koch is chief executive officer of Koch Industries Inc. and has a net worth of $25 billion. He and his brother David Koch inherited the oil and chemical refining business from their father, expanding it to include process and pollution control equipment and technologies, polymers and fibers, minerals, fertilizers, commodity trading and services, forest and consumer products, and ranching. Bo Rader/Wichita Eagle/MCT/Newscom/File
David Koch, executive vice president of Koch Industries, Inc., has, like his brother Charles, a net worth of $25 billion. He is a prominent patron of the arts who once ran for the US vice presidency as a libertarian candidate. He has said of President Obama, 'He's the most radical president we've ever had as a nation... and has done more damage to the free enterprise system and long-term prosperity than any president we've ever had.' Jim McDonald/WENN/Newscom/File
George Soros, chairman of the Soros Fund Management and Open Society, has a net worth of $22 billion. His stock-picking career has spanned nearly four decades, and he said in July that he now will manage money only for himself and his family as new regulations threaten to crimp the hedge fund industry he made famous. Shannon Stapleton/Reuters/File
Sheldon Adelson is a casino magnate with a net worth of $21.5 billion. After growing up in Dorchester, Mass., he went from selling toiletry kits to running computer trade shows to operating businesses such as the Venetian Resort Hotel Casino in Las Vegas. Originally a Democrat, he became a Republican after he amassed a fortune, saying, 'Why is it fair that I should be paying a higher percentage of taxes than anyone else?' Mike Clarke/AFP/Getty Images/Newscom/File
Siblings Alice, Rob, and Jim Walton are heirs to the Wal-Mart fortune, with net worths of $20.9 billion, $20.5 billion, and $21.1 billion respectively. Alice was the chief executive officer of the Llama Company, which she founded; Rob is Chairman of the board of directors of Wal-Mart, and Jim is Chairman of Arvest Bank. The Waltons' sister-in-law, widow Christy Walton, is worth even more than they are at $24.5 billion. Richey Miller/Cal Sport Media/Zuma Press/Newscom/File
New York Mayor Michael Bloomberg has a net worth of $19.5 billion from his founding and 80 percent ownership of Bloomberg L.P., a financial news and information services media company. Mr. Bloomberg owns a large waterfront vacation home in Bermuda, to which he routinely travels on a private plane to escape the stress of governing the city of New York. It's a long way way from Medford, Mass., where he grew up. Henny Ray Abrams/AP/File
Jeff Bezos, worth $19.1 billion, is the founder, president, chief executive officer, and chairman of the board of Amazon.com. He was a financial analyst before founding Amazon in 1994. Growing up in New Mexico, Texas, and Miami, Mr. Bezos showed a strong affinity for computer science all the way through his Princeton education. In 2010, his salary was only $81,840. Emmanuel Dunand/AFP/Getty Images/Newscom/File