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David O Morgan is Emeritus Professor of History and Religious Studies at the University of Wisconsin-Madison. One of the foremost authorities on the Mongols and the Mongol Empire writing in English, he is the author of The Mongols (1986, second edition 2007) and Medieval Persia, 1040-1797 (1988, second edition 2015). He co-edited with Anthony Reid Volume 3 of The New Cambridge History of Islam titled The Eastern Islamic World, Eleventh to Eighteenth Centuries. He is a former editor of the Journal of the Royal Asiatic Society (1987-99) and is now an advisory board member of the book series Cambridge Studies in Islamic Civilization. Sarah Stewart is Lecturer in Zoroastrianism at SOAS in the University of London. A former Deputy Director of the London Middle East Institute (LMEI), she has co-edited six previous volumes in The Idea of Iran series. She curated The Everlasting Flame exhibition in London in 2013, serving as editor of a volume published by I.B.Tauris in the same year under the same title. She also co-edited with Alan Williams a later book entitled The Zoroastrian Flame: Exploring Religion, History and Tradition (I.B.Tauris, 2016).