Harry Markopolos, the "whistleblower" who contacted the SEC about Madoff's "Ponzi scheme" several years ago, testfied before a hearing of the House Financial Services subcommittee on capital markets yesterday. You can read his submitted written testimony and supplemental documents that he submitted along with the testimony including email exchanges and lengthy memos he sent to the SEC documenting irregulaties in Madoff's operations. Markopolos said he began his investigation into Madoff in late 1999 when a marketing executive from Rampart Investment Management Company Inc. told him of Bernard Madoff’s fantastic returns. Markopolos said he determined in less than four hours that Madoff’s operation was a fraud.
The Wall Street Journal has made the Court Document: Madoff Client List available. It is 163 tightly spaced pages long.