Robert Charles Zaehner had a gift for languages and became an expert in Oriental languages. As a result, he was chosen as a British counterintelligence agent in Tehran, Persia during World War II and an MI6 agent there after the war. He returned to academia and became Spalding Professor of Eastern Religions and Ethics at the University of Oxford and a Fellow of All Souls College, writing numerous books on religion, both eastern and western.
Information adapted from Wikipedia and the back cover of The Bhagavad-Gita which he translated and authored
Zurvanism is a now-extinct branch of Zoroastrianism that had the divinity Zurvan as its First Principle. In Zurvanism, one of old Persian religions, Zurvan is the hypostasis of Time (and Space). The name "Zurvan", (means 'time'), also appears in other belief systems, but in those religions are only nominally related to the Zurvan of Zurvanism. Zurvanism considered Ahura Mazda (the God) not the transcendental Creator, but one of two equal-but-opposite divinities under the supremacy of Zurvan. The central Zurvanite belief made Sepantare Mainyu (Ahura Mazda) and Angra Mainyu (Ahriman) twin brothers that had co-existed for all time. توسط تیمور قادری به فارسی برگردانده شده و انتشارات فکر روز آن را در 1374 منتشر کرده است