Paul Volcker is widely-regarded as single-handedly halting a period of severe inflation in the U.S. during the late 1970s and early 1980s. But the former chairmen of the Federal Reserve’s reputation wasn't always so secure. So how does he view his legacy? Christine Harper, the editor of Bloomberg Markets, spent two years working with Volcker to co-author his autobiography, “Keeping At It: The Quest for Sound Money and Good Government.”