John Jelonnek (M-97, SM-15) received the Dipl.-Ing. and the Dr.-Ing. degrees in electrical engineering from Hamburg University of Technology (TUHH), Hamburg, Germany, in 1991 and 2000, respectively.
At TUHH, he was mainly involved in the research and development of rigorous self-consistent analyses for gyrotron oscillators in the time domain (slow- and fast-time scales) and in the frequency domain, with particular focus on gyrotron operation at mismatched conditions and injection locking. From 1997 to 2011, John Jelonnek was working in several different positions in industry, including research and development, technology and business management.
Since 2011, John Jelonnek is the Director of the Institute for Pulsed Power and Microwave Technology (IHM) at the Karlsruhe Institute for Technology (KIT), Karlsruhe, Germany. IHM is doing research in the areas of pulsed power and high power microwave technologies. Both, research and development of high power microwave sources as well as related applications are in the focus. Applications for pulsed power technologies are ranging from materials processing to bioelectrics. Microwave technologies are focusing on RF sources (gyrotrons) for electron cyclotron resonance heating and on applications for material processing at microwave frequencies. John Jelonnek is a Professor for high-power microwave technologies at KIT.
John Jelonnek has served on the IEEE Plasma Science as Guest Editor for the August 2016 T-PS Special Issue on High-Power Microwave Generation. He is invited guest editor for the 2018 IEEE T-ED Special Issue on Vacuum Electronics. John Jelonnek is serving in the Technical Program Committees and Technical Review Committees of different conferences, e.g. EUMW, IMS, GEMIC, IRMMW-THz. Starting from 2018, John Jelonnek is an elected member of the IOC of the IRMMW-THz conference.