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Greenberg joined The Aerospace Corporation in 1978 as a member of the technical staff in Laboratory Operations. Subsequent positions included manager, Electro-Optics Section, and director, Optical Systems Department, Engineering Group; principal director, Research and Program Support, Laboratory Operations; principal director, Surveillance and Defense Integration Directorate, Programs Group; principal engineer, Systems Planning and Development Office, Development Group; and principal director, Plans and Systems Architecture, Development Group.
He advanced to general manager, Advanced Planning and Technology Division, Development Group; general manager, Advanced Projects and Technology Division, Space Systems Group; and vice president of Laboratory Operations, the position he held before being named to the newly created position of vice president of Technology, Engineering and Technology Group. | 