(CNN Money) — Just over a year ago, in May 2009, word leaked to the press that the two richest men in America, Bill Gates and Warren Buffett, had organized and presided over a confidential dinner meeting of billionaires in New York City. David Rockefeller was said to have been a host, Mayor Michael Bloomberg and Oprah Winfrey to have been among those attending, and philanthropy to have been the main subject.
