President of PT.Tiara Titian Telekomunikasi (TT-Tel), a consulting company, since 1995;

Director Bureau Telecommunication Development (BDT) of ITU, 1993-1994;

Deputy Director General Standardization DG Postel, 1991-1992;

Deputy Director General Telecommunication DG Postel, 1989-1990;

Director, Telecommunication Convention and Legal Regulation,1980-1988;

Governor and Alternate Governor for South East Asian Group at INTELSAT Board of Governors,1978-1979;

Head, Satellite Planning Division, PN Telekomunikasi, 1977-1978;

Head, Transmission Section, DG Postel, 1973-1976;

Program Managar Palapa Domestic Satellite System, 1975-1976;

Head, Testing and Electronic Section, PN Postel Laboratories, 1966-1973;

Engineer at VHF/UHF Section, PN Postel Laboratories, 1963-1966.