Ikkoh Funaki received a Ph.D. degrees from the Department of Aeronautics and Astronautics, University of Tokyo, Tokyo, Japan, in 1995. His supervisor was Prof. Kyoichi Kuriki, and Ph.D. thesis title was “Magnetoplasmadynamic Plasm Flow of MPD Arcjet”. During 1996 and 2001, he was a Postdoctorial Fellow, then a Research Associate with the Institute of Space and Astronautical Science (ISAS), Japan, where he engaged himself in developing the microwave discharge ion engines for the asteroid sample return mission, Hayabusa. In 2001, he became an Assistance Professor with University of Tsukuba, and then, in 2003, he joined the Institute of Space and Astronautical Science (ISAS), which became the part of Japan Aerospace Exploration Agency (JAXA), where he is currently an Associate Professor. From 2003, with continuous involvement into the microwave ion engine, he conducted several R&Ds and related mission studies on MPD arcjet and some electric propulsion advanced concepts. Along with these research activities, during the Hayabusa mission, he supported space operation of the microwave ion engine system. From 2013, he started and has been leading the R&D of 6-kW-class SPT at JAXA in collaboration with Japanese industry and Japanese universities. His main project now is the next Japanese Engineering Satellite 9 (ETS-9), where his SPT will be tested to obtain a Japanese version of all-electric propulsion satellite in 2021.