RALPH MORRISON is a consultant and lecturer in the area of interference control and electronics. He has over thirty years of design and consulting experience, was president of Instrum Inc. for more than a decade, and has authored Grounding and Shielding Techniques, 4th Edition; Noise and Other Interfering Signals; Grounding and Shielding in Facilities; and Solving Interference Problems in Electronics, all published by Wiley.