Abu Bakr Al-Razi was the greatest Muslim medical scientist and surgeon. He had been the principal of a government hospital in Judeshahpur and Bagdad for a long time. At that time he became so famous that a huge number of patients came to him from West Asia and East Europe. During that period Al-Razi was the best among the surgeons. He performed operations in a better way than that of the Greekas. He wrote more than two hundred books. Among them more then one hundred are on medicine. The book entitled “Al Judari Wal Hasbah on pox and measles was so fundamental that even the people of the Christian world could not make any progress on this subject before this. He wrote another book entitled “Kitabul Mansuri” (complete in ten volumes). These two books have made Al-razi immortal in the history of medical science.