Ibn Sina (Avicenna) was a prominent Islamic scholar born in 980 AD in Bukhara. He made significant contributions in many fields including philosophy, medicine, and science. He wrote over 450 works, with his most influential being The Book of Healing and The Canon of Medicine. Ibn Sina made many important medical discoveries and introduced innovations such as quarantine, separate hospital wards based on illness, and using leeches and herbal remedies for treatment.