Leslie Caldwell knows a thing or two about accounting fraud, having been plucked from her post as criminal chief in the San Francisco U.S. attorney’s office in 2002 to head the Justice Department’s special Enron Task Force.

And Caldwell’s firm, Morgan, Lewis & Bockius, has been a go-to firm for Palo Alto-based Hewlett-Packard Co. The company’s current and former general counsel both hailed from Morgan Lewis, which receives a steady flow of HP’s litigation and transactional work.