Before joining the Laboratory in 1976, he was with the Electronic System Laboratory of MIT in charge of a NASA project on a multiple model adaptive control system for the F-8C aircraft. At Lincoln Laboratory, he has worked in many areas of ballistic missile defense, including multiple target tracking, discrimination, and system analysis. In 1992, he was appointed to lead the System Testing and Analysis group to be responsible for the Theater Missile Defense Critical Measurements Program (TCMP) which conducted a series of live missile tests in the Pacific in the 1990s. Currently, his main interest is in the development of decision support algorithms and architectures under the Project Hercules for the Missile Defense Agency. He is Group Leader of Missile Defense Elements, MIT Lincoln Laboratory.