רב האי גאון

Hai ben Sherira, better known as Hai Gaon, was a medieval Jewish theologian, rabbi and scholar who served as Gaon of the Talmudic academy of Pumbedita during the early 11th century. He was born in 939 and died on March 28, 1038. He received his Talmudic education from his father, Sherira ben Hanina, and in early life acted as his assistant in teaching. In his forty-fourth year he became associated with his father as "av bet din", and with him delivered many joint decisions. According to Sefer HaKabbalah of Rabbi Abraham ben David (Ravad), he was the last of the Geonim.