"I've never gotten such a grilling in my life," Weld recalls. It was his introduction to what he calls Giuliani's "rattrap" of a mind. The two spent seven years working together at Justice. Weld went on to become governor of Massachusetts; Giuliani became "America's mayor" after the September 11 terrorist attacks on New York City. Now they're colleagues again: Giuliani has joined Weld's private equity firm, Leeds Weld Equity Partners, as chairman of its board of advisers.