Frithjof Schuon (1907-1998) is best known as the foremost spokesman of the Perennial Philosophy. A gifted artist and poet as well as the author of over twenty books on religion, metaphysics, sacred art, and the spiritual path, Schuon's books have been translated into over a dozen languages and are respected by academic and religious authorities alike.

Harry Oldmeadow was Coordinator of Philosophy and Religious Studies at La Trobe University Bendigo, Australia, until his recent retirement. He is a well-respected authority on the Perennialist school of comparative religion and the author of Frithjof Schuon and the Perennial Philosophy. He lives in Bendigo, Australia.

Huston Smith (1919-2016) was Thomas J. Watson Professor of Religion and Distinguished Adjunct Professor of Philosophy, Emeritus, at Syracuse University. One of the world's leading scholars on comparative religion, he was author of the bestselling The World's Religions.