Among books he has written or co-edited are: Belief Transformations: Some Aspects of the Relation between Science and Religion in Transcendental Meditation (TM) and the International Society for Krishna Consciousness (ISKCON) (1996), Secular Theories on Religion: Current Perspectives (2000) (co-author with Tim Jensen), New Age Religion and Globalization (2002), New Religions in a Postmodern World (2003) (co-editor with Reender Kranenborg) and The Cambridge Companion to New Religious Movements (2012) (co-editor with Olav Hammer).
