How to Think Impossibly: About Souls, UFOs, Time, Belief, and Everything Else

The Superhumanities: Historical Precedents, Moral Objections, New Realities

Esalen: America and the Religion of No Religion

Comparing Religions

Mutants & Mystics: Science Fiction, Superhero Comics, and the Paranormal

Authors of the Impossible: The Paranormal and the Sacred

Secret Body: Erotic and Esoteric Currents in the History of Religions

The Serpent's Gift: Gnostic Reflections on the Study of Religion

The Super Natural: Why the Unexplained Is Real

Changed in a Flash: One Woman's Near-Death Experience and Why a Scholar Thinks It Empowers Us All