William James's The Varieties of Religious Experience was an intellectual landmark, paving the way for modern study of parapsychology and religious experience. In this indispensable new companion to the Varieties, key international experts in the fields of religious studies, psychology and mysticism offer contemporary responses to James's book, exploring its historical importance and modern relevance. As the only critical work dedicated to the cross-disciplinary influence of The Varieties of Religious Experience, it stands as a testament to James's genius and ongoing legacy.