The article entitled "Sufi Philosophy" in the famous 1967 edition of The Encyclopedia of Philosophy has long struck me as something of an enigma. It was authored by a William Gerber who, I suspect, was the author of an ambitious (but long forgotten) work of analytical philosophy entitled The Domain of Reality (1946). Why Gerber was selected by the editor of the Encyclopedia to contribute an article on Sufism is unclear. There are a variety of factual errors in the article that suggest he had no access to texts in Arabic or Persian (andor little or no facility in either language). He was entirely dependent upon Orientalist scholarship for what information he had about / tasawwuf and, even then, appears to have misread some of his sources.