Gerd Gantenbein received the Dipl. Phys. degree in physics and the Dr.-Ing. degree in electrical engineering from the University of Karlsruhe, Karlsruhe, Germany in 1988 and 1993, respectively. In 1988, he joined the Research Center Karlsruhe where he was involved in the development of high power gyrotrons. His research interests included numerical simulation and experimental optimization of gyrotron oscillators. From 1993 to 2005, he has been with the Institute of Plasma Research, University of Stuttgart, Stuttgart, Germany, where he was working on the development of transmission systems for high power radiation. He was also involved in studies and experiments on the interaction of microwaves in magnetically confined plasmas for nuclear fusion applications, especially suppression and stabilization of so-called neoclassical tearing modes. Since 2005 he is with the Institute for Pulsed Power and Microwave Technology of the Research Center Karlsruhe (KIT/FZK) where he is acting as head of the division High Power Microwave Technology. His current research projects are the development of high power gyrotrons, frequency step-tunable gyrotrons and multi-megawatt gyrotrons for electron-cyclotron resonance heating and current drive systems in fusion plasmas.