He then continued his studies at the Faculty of Usul al-Din of IAIN Syarif Hidayatullah and graduated in 1968. He folowede short-term courses at the University of Leiden in 1978 and 1983. Before leading the newly created Faculty of Da’wah, he had been dean of the Faculty of Usul al-Din at his alma mater.
In 1984, he defended a doctoral dissertation entitled Politik Islam Hindia Belanda (The Islam Policy of the Netherlands Indies Government). The dissertation was published by LP3ES in 1985 with a preface by the Dutch scholar Dr. Karel Steenbrink, who had been the main supervisor of his graduate research.
Besides that he wrote several books on da’wah, Taubat (Repentance), and Problematika Dakwah (Problems of Islamic Propagation), among other publications. It was as a specialist of da’wah that he was invited by various institutions to preach in Malaysia, Singapore, the Netherlands, Belgium, Germany, and Britain. He was also active in the MUI and the Lembaga Pengembangan Tilawatil Qur’an (LPTQ – Institute for Development of Koran Reading).
In early 1993, he was nominated by several members of the academic community to be a candidate for the new rectorship of the JAIN Jakarta. (RE, 25 Sep. 1994)
Source: INIS Newsletter Vol XII 1996, pp.149-150