Whitall Nicholson Perry (January 19, 1920 - November 18, 2005) was an American author born in Belmont, Massachusetts, member of the Perennialist School, which is based primarily on the work of René Guénon, Ananda Coomaraswamy and Frithjof Schuon. Perry’s major opus, A Treasury of Traditional Wisdom, is a compilation of thousands of quotations from all the great religious and esoteric traditions, supported by commentaries.
Whitall Perry in the chapter 'The Man and the Witness' described Guénon as possessing a "mathematical precision...in the domain of cosmological sciences" while Coomaraswamy worked on "expanding these truths over the vast field of...universal beauty". Schuon completed the triangle.
This book shows that Perry follows this same triangle, closely, on the key metaphysical truth of non-dualism and gnosis, while not losing any individuality. With the "work" of the philosophia perennis already being completed, Perry writes with, I would tentatively say, a sensible lack of urgency, evident in the documentation utilised and somewhat in the stylistic tone. Every chapter, excluding the ones towards the end on Perry's 'autobiographical' experiences with Coomaraswamy, blend into a similar theme, without losing any of its potency.