Shanon is the author of the 2002 book Antipodes of the Mind: Charting the Phenomenology of the Ayahuasca Experience published by Oxford University Press.
He writes that he had consumed ayahuasca himself several hundred times and gathered a corpus of empirical data from published literature, structured and unstructured interviews he conducted and his personal experience.
Shanon's controversial theory that the patriarch Moses was under the influence of hallucinogens when he received the law, is referred to as the Biblical entheogen hypothesis.
[1] His paper, Biblical Entheogens: a Speculative Hypothesis details parallels between the effects induced by the psychedelic brew ayahuasca, and the Bible's account of the life of Moses.
He further corroborates his hypothesis with botanical and ethnobotanical information, linguistic considerations, exegesis of Talmudic and mystical Jewish texts, as well as data on the effects of a substance analogous to ayahuasca.