Yahya al-Bahrumi (born John Thomas Georgelas, also known as Ioannis Georgilakis and used the kunya Yahya Abu Hassan; December 2, 1983 – October 2017) was an American jihadist, Islamic scholar, and supporter of the Islamic State (ISIL). Having converted to Islam, he studied to the point of developing "a staggering mastery of Islamic law and classical Arabic language and literature". He was close to Abu Muhammad al-Adnani, the ISIL spokesman, chief strategist, and director of foreign terror operations.