(CBS News) Forbes released its 32nd annual list of the 400 wealthiest Americans on Monday. The list ranks the nation's wealthiest billionaires and for the first time, the combined net worth of those listed exceeds $2 trillion. Microsoft's Bill Gates tops the list and Facebook's Mark Zuckerberg is back in the top 20 portion of the list after a 2-year hiatus.
Go to Forbes for the full list along with infographics and how these top-earners are putting their money to work to improve society.
Bill Gates Warren Buffett Larry Ellison Charles Koch David Koch Christy Walton Jim Walton Alice Walton S. Robson Walton Michael Bloomberg
For the full list and a look at the 2012 Forbes 400 list, visit Forbes.