RON LENK has more than twenty years' experience in both commercial and military power electronics. He is recognized as one of the world's experts on the subject of digital control of power supplies and has published numerous papers in the field of power supplies. He holds twelve U.S. patents, including key patents for the power system of the International Space Station. Mr. Lenk currently heads the design group for Tyco Electronics' Battery Systems and Design Services. He is on the advisory board of Power Electronics Technology magazine, the leading magazine for power designers, and is also on the advisory board for PowerSystems World, the leading power supply conference for practical power supply design.