Dr Sayyid Jaafar Fadlallah undertook his seminary education at the Islamic Sharīʿa Institute in Beirut between 1993 and 2010, completing his advanced studies (dars al-khārij) under Ayatollah Mohammad Hussein Fadlallah. Alongside his seminary studies, he also obtained undergraduate and postgraduate degrees in sociology from the Lebanese University in Beirut, culminating in a PhD for a thesis on the image of the other in Muslim jurisprudence.  

At the Al-Mahdi Institute, Dr Sayyid Fadlallah is a Lecturer in Islamic Jurisprudence where he teaches a wide range of courses on different topics in Muslim legal thought. In Lebanon, he is also an Instructor of Sociology at the Lebanese University, a Lecturer in Islamic Jurisprudence at the Islamic Sharīʿa Institute, and the General Supervisor of Religious Affairs at the al-Mabarrat Association, amongst other roles.  

He has several publications to his name and has presented his research at academic conferences in Lebanon, the UK, Iraq, Turkey and elsewhere.