Cornelius J. Dennehy currently serves as the NESC Discipline Expert for Guidance, Navigation and Control (GN&C). Mr. Dennehy joined NASA in 2000 as the assistant chief for technology for the GN&C Division of Goddard Space Flight Center in Greenbelt, MD. He is the primary author or co-author of over twenty technical publications in the fields of GN&C, space systems, and technology. His principal areas of expertise and interest include spacecraft attitude determination and control system design, space platform controls-structures interaction modeling, simulation and analysis, and the infusion of technology into future missions. Mr. Dennehy received a bachelor of science in mechanical engineering from the University of Massachusetts at Amherst and a master of science in aeronautics and astronautics from the Massachusetts Institute of Technology.