Organizations
- Christen Studenten Vereniging (CSV), Bandung, 1934
- Indonesische Studenten Vereniging (ISV), Bandung, 1934
- Timorese Jongeren/Chairman of Timorese Nationalist Group (PKT), Bandung, 1934
- Member, Indonesian Young Civil Servants Association (AMPRI), Jakarta, 1945
- Chairman, Indonesian Lesser Sunda People's Movement (GRISK), 1947
- Founder, Greater Indonesi Party (PIR) 1948
- Chairman, Hatta Foundation, 1950–1992
- Chairman of Gadjah Mada University Alumni Association (KAGAMA), 1958–1961, 1973–1981
- Had been the Head of Yogyakarta's Veterans Legion
- Had been in the Central Board of the Indonesian Veterans Legion (LVRI)
- Member of Indonesian Engineers Association (PII)
- Had been an Hononary Member of the Indonesian Academy of Sciences (AIPI)
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