Mac McQuown is an 80-year-old financial engineer who helped pioneer modern quantitative investing. He is developing a new type of hybrid security called an "eBond" that embeds a credit default swap into a corporate bond to make it less risky and more liquid. The eBond aims to address the growing liquidity issues in the $8 trillion corporate bond market by transforming junk bonds into essentially AAA rated notes. If successful, the eBond could help revive trading activity in the corporate bond market. However, some critics argue that financial innovations often fail to benefit investors and can even destabilize markets.