Abu al-Hasan Ali ibn Sahl Rabban al-Tabari (Persian: علی ابن سهل ربان طبری ‎) (c. 838 – c. 870 CE; also given as 810–855[1] and 783–858)[2] was a Persian Muslim hakim, Islamic scholar, physician and psychologist [1] of Zoroastrian[3][4] descent, who produced one of the first encyclopedia of medicine. He was a pioneer of pediatrics and the field of child development.