This expert is the Director of the Avionics Engineering Department at a major University. His research deals with navigation systems including ILS, MLS, VOR, Loran-C, DME, INS and GPS. He is internationally recognized for his work in characterizing GPS multipath and is one of the originators of the integrated multipath-limiting antenna for GPS. He has co-authored chapters for AIAA books on GPS in addition to numerous conference papers and journal articles. He is a licensed professional engineer and is an instrument-rated commercial pilot.