George D. Chryssides is a Visiting Fellow at York St John University, and was previously Head of Religious Studies at the University of Wolverhampton. He has published extensively in scholarly journals and has authored and edited several books including The Path of Buddhism (1988), The Advent of Sun Myung Moon (1991), The Elements of Unitarianism (1998), Exploring New Religions (1999), A Reader in New Religious Movements (co-edited with Margaret Z. Wilkins, 2006), Historical Dictionary of Jehovah's Witnesses (2008), Christianity Today (2010), Heaven's Gate (2011), Christians in the Twenty-First Century (with Margaret Z. Wilkins, 2011), Historical Dictionary of New Religious Movements (2nd edn 2012), The Study of Religion (with Ron Geaves, 2nd edn 2013), and The Bloomsbury Companion to New Religious Movements (with Benjamin E. Zeller, 2014).