Muhammad ibn Zakariya al-Razi
The practice of ancient Iranian medicine was interrupted by the Arab invasion (630 A.D.). However, the advances of the Sassanid period were continued and expanded upon during the flourishing of Islamicate sciences at Baghdad, with the Arabic text Tārīkh al-ḥukamā crediting the Academy of Gondishapur for establishing licensure of physicians and proper medical treatment and training. Many Pahlavi scripts were translated into Arabic, and the region of Greater Iran produced physicians and scientists such as Abū ʿAlī al-Ḥusayn ibn ʿAbd Allāh ibn Sīnā and Muhammad ibn Zakariya al-Razi as well as mathematicians such as Kharazmi and Omar Khayyám. They collected and systematically expanded the Greek, Indian, and Persian ancient medical heritage and made further discoveries.