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