Both his father and son were qāḍīs (his father Maḥmūd was a prominent judge at the time of Sulṭān Murād). He studied with al-Sayyid al-Sharīf al-Jurjānī. Teacher of Ulugh Beg (who was also his patron) and one of the heads of the Samarqand Observatory. Head of the large madrasa there and Ulugh Beg himself sometimes attended his lectures. `Alī Qūshjī continued the observational program after Qāḍīzāde’s death. Grandfather of the Ottoman astronomer/mathematician Mīrim Çelebī (d. 931/1525). [Ragep]