Dr. Abdullah is the Secretary General of the Islamic Council for Call and Relief, Vice Chairman of the Board of Trustees of the Chittagong Islamic University in Bangladesh and Academic Advisor to the College of Islamic Studies in Dubai. He was appointed as an instructor at the College of Shariah after his graduation in 1391H (corresponding to 1971), and worked as Dean of the College of Shariah and Arabic Language in Abha in 1396H (corresponding to 1976), and continued as Dean of the College of Shariah South Branch until 1415H (corresponding to 1995). He has many publications on financial transactions and others, including Advantages of Islamic Banks, Murabaha from Jurisprudential Heritage to Contemporary Applications in Islamic Banks, Guide to Hajj and Umrah Rituals and others.  

Dr. Abdulwahab holds a Ph.D. from the Higher Institute of Judiciary from Imam Muhammad bin Saud Islamic University with an excellent grade and First-Class Honors from the Department of Comparative Jurisprudence. His thesis was entitled: Incidental dispositions on financing contracts and banking services, a comparative jurisprudential study - a printed thesis. Dr. Abdulwahab has 13 years of judicial experience in the public judiciary and is a former member of the Scientific Council of the Prince Muhammad bin Fahd bin Jalawi Foundation, former Chairman of the Endowments Committee at Al-Ahsa Chamber and former teaching assistant at King Faisal University College of Law.