Dr. Mitchell is a Principal Professional Staff Physicist at the Johns Hopkins University Applied Physics Laboratory. Dr. Mitchell's research interests have included radio astronomy, solar flares, solar wind, and various terrestrial and planetary magnetospheric topics. He is presently focusing on the magnetospheric physics of the Earth and of Saturn. He is or has been the Project Manager for several NASA and NSF analysis grants and contracts, and is involved in the design of a new generation of space instrumentation for the imaging of planetary magnetospheric energetic plasmas, in particular as Instrument Scientist for the Magnetospheric Imaging Instrument on the NASA Saturn mission, Cassini, and as the Lead Investigator for the HENA instrument on the NASA IMAGE Mission. He has also designed miniaturized instrumentation for ion mass and energy analysis in space. He serves on the National Research Council Committee on International Programs, and has served other NRC and NASA committees. He has lectured in the Johns Hopkins University Whiting School of Engineering, Space Systems Course at APL since 1990.