Lewis S Ranieri

The "godfather" of mortgage finance, who pioneered mortgage-backed bonds in the 1980s and immortalised in Liar's Poker. Famous for saying that "mortgages are math", Ranieri created collateralised pools of mortgages. In 2004 Business Week ranked him alongside names such as Bill Gates and Steve Jobs as one of the greatest innovators of the past 75 years. Ranieri did warn in 2006 of the risks from the breakneck growth of mortgage securitisation. Nevertheless, his Texas-based Franklin Bank Corp went bust in November due to the credit crunch.