*Born: at Pematangsiantar, 02 March 1944.
-Study: Elementary, Yunior and High School, 1950 - 1962 at Pemtangsiantar.
-Study: S1, Fakultas Teknik ( Technical) Univ. Gajah Mada, 1962 - 1967, Jogyakarta; Fakultas Ekonomi Ext. (Business Adm.) Univ. Indonesia, 1980 - 1985, Jakarta;
*Work: Lemigas (Oil & Gas Inst'n) Cepu, 1967 - 1970.; Pemda DKI Jakarta ( Jakarta Local Gov.) 1970 - 2000, last position as 'Kepala Biro Pembangunan'; Work from home and Consultant at Jakarta, 2000 until now.
*Social activity: Gerakan Mahasiswa Kristen Indonesia (GMKI)/ (Christian Student Movement), Jogyakarta, 1962 - 1967, last position as one of the board of chairmen of Jogyakarta branch; Satgasnas Pemuda (National Youth Task Unit), a member, Jakarta, 1985 - 1990; volunteer consultant for PGI Cikini Hospital and PGI Jakarta Theological Institute, Jakarta, 1997 until now ;
*Family: Wife, Dewi L Sipahutar; Children, 1 daughter, Donna Simbolon Sinaga.