Dr. Zellweger has an extensive background in aviation system engineering and design, research and development (R&D), system acquisition, R&D management, and program management. He earned a Ph.D. (1971) in computer science with a minor in cognitive psychology from the department of Applied Mathematics at Harvard University. In 1997 Dr. Zellweger was appointed Associate Provost for Graduate Programs and Research at Embry-Riddle Aeronautical University, following a 25-year career with the United States (US) Federal Aviation Administration (FAA). At the FAA held a variety of research, operations research, system engineering, and system acquisition positions. His last position was that of director of the FAA Office of Aviation Research. He was responsible for FAA R&D Policy and served as the FAA's spokesperson for research. He managed the FAA's R&D program as well as the acquisition of $140M of security equipment for major US airports. At Embry-Riddle his primary job was to foster research activities throughout the University, to build research partnerships with industry, government, and academia and to strengthen Embry-Riddle's graduate programs. Dr. Zellweger was also on the faculty of the Department of Computing and Mathematics where he taught a graduate seminar entitled "Building Safe Systems - Technical, Economic, and Political Perspectives." Currently, Dr. Zellweger is on an assignment from Embry-Riddle to NASA headquarters, as special assistant for aviation in the Office of Aerospace Technology. Since 2003 he has been seconded by NASA to the interagency Joint Planning Office for the Transformation of the Air Transportation System. In 1984 he received the Department of Transportation Silver Medal for his conceptual work on the replacement of FAA's air traffic control computer systems. Dr. Zellweger became a member of the Senior Executive Service in 1985. In 1996 Dr. Zellweger was honored with the US Government's Presidential Rank Award.