Dr. Roger J. Sullivan received the B.S. and Ph.D. degrees in physics from the Massachusetts Institute of Technology, with a thesis in X-ray astronomy. At System Planning Corporation, Arlington, VA, he led analyses of arms control options and nuclear weapons effects. He then contributed to the development of a series of imaging instrumentation radars, which are operated on outdoor and indoor radar ranges. At the Environmental Research Institute of Michigan (now Veridian), Ann Arbor, MI, he served as Program Manager for development of an X/C/L-band polarimetric synthetic aperture radar (SAR) carried by a US Navy P-3 aircraft, and led many analyses concerning SAR performance and automatic target recognition. Currently, at the Institute for Defense Analysis, Alexandria, VA, he advises the US government concerning SAR and ground-moving target indication (GMTI) radars on unmanned aerial vehicles (UAVs), and performs analyses concerning new radar concepts for ballistic missile defense, air defense, and mine detection.