Michael Hamersley is a tax lawyer who, in 2003, became a corporate whistleblower against the accounting firm KPMG's tax shelter fraud. In 2006 he was a candidate for the U.S. Congress in California's 4th congressional district, obtaining third place in the Democratic party primary. Wikipedia*
On the C-SPAN Networks:
Michael Hamersley has one video in the C-SPAN Video Library; the first appearance was a 2003 Senate Committee.