He was active during the reign of Timur, who noticed him as a promising scientist and supported his scholarship, and was part of his court.
Ibn Hajar al-Asqalani famously remarked about him that "science ended with him in the East" and "no one could ever replace him".
[14] During his lifetime, he wrote treaties on grammar, rhetoric, theology, logic, law and Quran exegesis.
[1] Ibn Khaldun said of him: [17][18] I found in Egypt numerous works on the intellectual sciences composed by the well-known person Sa'd al-Din al-Taftazani, a native of Herat, one of the villages of Khurasan.
Some of them are on kalam (speculative theology) and the foundations of fiqh and rhetoric, which show that he had a profound knowledge of these sciences.