Abu Bakr al-Razi (854–925 CE), commonly known as Al-Razi, was a Persian polymath who made significant contributions to various fields including medicine, philosophy, alchemy, and chemistry. Born in Ray, Iran, he studied and practiced medicine extensively, becoming one of the most renowned physicians of his time. Al-Razi's medical encyclopedia "Kitab al-Hawi" (The Comprehensive Book) compiled vast amounts of medical knowledge from ancient Greek, Persian, and Indian sources. He also wrote philosophical and theological works, including "Al-Mulakhkhas fi al-Tibb" (The Summary in Medicine), and made pioneering advancements in chemistry and alchemy. Al-Razi's contributions laid the groundwork for the development of modern medicine and chemistry, and he is considered one of the greatest scholars of the Islamic Golden Age.