John Harvey is a practitioner and historian of sound art and visual art. He is Professor at the School of Art, Aberystwyth University. His research field is the visual and sonic culture of religion. In art history, his studies engage the visual imagery of popular piety, supernaturalist traditions, and working-class culture. He has written a number of books including The Bible as Visual Culture; Photography & Spirit; The Appearance of Evil: Apparitions of Spirits in Wales; Image of the Invisible: The Visualization of Religion in the Welsh Nonconformist Tradition; and The Art of Piety: The Visual Culture of Welsh Nonconformity. In art practice, his work explores visual, textual, and aural sources of Protestant Christianity, theological and cultural ideas, and systemic processes. The work is discussed in The Aural Bible series of CD releases, and The Pictorial Bible series of exhibitions.