Al Yasa' Abubakar (Prof., Dr., MA.) is listed as a member of the Advisory Board of ICMI Aceh (Orwil Aceh) for 2026–2031. Born in Takengon on 12 January 1953, he attended primary and junior Islamic schools in Takengon, entered the Sharia Faculty of IAIN Ar-Raniry in 1970, studied usul al-fiqh at Al-Azhar University, and earned his doctorate from IAIN Sunan Kalijaga Yogyakarta in 1989 with a dissertation comparing Hazairin's reasoning with classical madhhab jurisprudence on blood-relative heirs. A lecturer at the Sharia Faculty of IAIN (now UIN) Ar-Raniry since 1982, he served as Vice Rector I and as acting rector after Rector Safwan Idris was killed during the Aceh conflict. He later headed the Aceh Islamic Sharia Office (Dinas Syariat Islam), sat on the Aceh Ulama Consultative Council (MPU), and chaired the Sharia Advisory Board of Baitul Mal Aceh. He is widely regarded as one of the conceptual architects of Islamic law implementation in Aceh under Laws No. 44/1999 and No. 11/2006, and has written many books and articles on Islamic law and the qanun jinayah.