Hexham has written or co-edited a number of works treating various facets of religion in South Africa including African independent churches, Afrikaner Calvinism, and Zulu religion. He has compiled reference works such as the "Concise Dictionary of Religion" and "Pocket Dictionary of New Religious Movements". He has co-written two analytic works on the phenomenon of new religions and cults, and co-edited a pioneering work on the development of Christian contextual missions and new religious movements. Currently, as can be seen from his recent publications, Hexham is working on issues related to Germany.