LINDA McCARTHY has broken into thousands of systems on corporate intranets to demonstrate how easily an intruder could shut down executive networks, kill manufacturing processes, or even crash world-wide computer operations. She provides consultative services to executive managers to help them understand the levels of risk on their networks. Linda has also taught courses in hardware architecture, system administration, and UNIX security. She currently leads a global security research and development team at Sun Microsystems, Inc.