Prior to the 12th century, women accounted for less than one percent of the world’s Islamic scholars. However, al-Sakhawi and Mohammad Akram Nadwi have since found evidence of over 8,000 female scholars since the 15th century. al-Sakhawi devotes an entire volume of his 12-volume biographical dictionary al-Ḍawʾ al-lāmiʻ to female scholars, giving information on 1,075 of them. More recently, the scholar Mohammad Akram Nadwi, currently a researcher from the Oxford Centre for Islamic Studies, has written 40 volumes on the muḥaddithāt (the women scholars of ḥadīth), and found at least 8,000 of them.