Ehsan YarshaterEhsan Yarshater is Hagop Kevorkian Professor of Iranian Studies at Columbia University and Director of its Center for Iranian Studies. He serves as General Editor of the Encyclopaedia Iranica and of its Bibliotheca Persica, which includes the ersian Heritage Series, the Persian Studies Series, and the Modern Persian Literature Series. He is General Editor of the History of al-Tabari described herein. Read More Read Less