Ibn Hajar al Asqalani

AlHaafidh Shihabuddin AbulFadl Ahmad ibn Ali ibn Muhammad, better known as Ibn Hajar due to the fame of his forefathers, alAsqalani due to his family origin , was a medieval Shafiite Sunni scholar of Islam who represents the entire realm of the Sunni world in the field of Hadith, also known as Shaykh al Islam. He authored some 50 works on hadith, history, biography, tafsir, poetry, and Shafiite jurisprudence, the most valued of which being his commentary of the Sahih of Bukhari, titled Fath alBari.

He was born in Cairo in 1372, the son of the Shafii scholar and poet Nur alDin Ali. Both of his parents died in his infancy, and he and his sister, Sitt alRakb, became wards of his fathers first wifes brother, Zaki alDin alKharrubi, who enrolled Ibn Hajar in Quranic studies when he was five years old. Here he excelled, learning Surah Maryam in a single day and memorising the entire Quran by the age of 9. He progressed to the memorization of texts such as the abridged version of Ibn alHajibs work on the foundations of fiqh.

Source: Wikipedia