Senior research fellow Indian Institute of Science, 1970-1972. Graduate assistant Southern Illinois University, Carbondale, 1972-1976. Senior member technical staff Compuer Science Corporation, Silver Spring, Maryland, 1977-1979, Communications Satellite Corporation Corporation, Clarksburg, 1979-1984.
Branch chief Voice of America/United States Information Agency, Washington, 1984-1988. Division chief Defense Information Systems Agency, Arlington, Virginia, 1988—2002. Chief engineer Center for Command Control Applications, Falls Church, since 2002.