Millimeter Wave Imaging, Vacuum Microelectronics, Phased Array Antennas, Microwave Tube Design, High Power Microwave Sources, Free Electron Lasers, Plasma Physics, Wave-Plasma Interactions, Ultrashort Pulse Electronics, High Power Millimeter Wave Sources, Millimeter Wave Quasi-Optical Grid Arrays, Laser Diagnostics, RF Accelerators, Advanced Light Sources, , Gyrotrons, MEMS , Cancer Diagnostics and Treatment.