 A prominent Ismaili da’i or missionary, he was considered by the central headquarters of the Fatimid da’wa in Cairo as one of the most learned Ismaili theologians and philosophers of the Fatimid period.It was in that capacity that al-Kirmani played an important role in refuting the extremist ideas of some of the dissident "da'i"s, who by proclaiming al-Hakim's divinity had initiated the Druze movement.Al-Kirmani was summoned in 1014 or shortly earlier to Cairo where he produced several works to disclaim these extremist doctrines.