• Founder and Director of PT. Tiara Titian Telekomunikasi, Consulting (TT-Tel), a telecommunication consulting company established since September 1995;
• First Director of the ITU Bureau for Telecommunications Development (BDT), Geneva – 1992, until end 1994;
• Deputy Director General for Telecommunications at the Directorate General of Posts and Telecommunications (DG POSTEL), 1988 – 1991, and Deputy Director General for Posts and Telecommunication Standardization, 1991-1992;
• Commissioner of the Board of Commissioners of PT. INDOSAT, 1989-1992.
• Director for Telecommunication Conventions and Legal Regulations of at DG POSTEL, 1980 - 1988;
• Program Manager of the first