Clarke served as Professor Emeritus of the History and Sociology of Religion at King's College London, having taught there from 1994 to 2003, the Director of the Centre for New Religions at King's College, and a professorial member of the Faculty of Theology at the University of Oxford ; earlier in his career he was Professor of African History at the University of Ibadan, Nigeria. Clarke inaugurated a series of annual conferences on new religious movements at King's, which brought together academics from a variety of backgrounds. These conferences eventually evolved into the "INFORM" seminars. Clarke was the founding editor of the Journal of Contemporary Religion, established by the Centre for New Religions in 1985. Clarke's research fields have spanned Islamic movements as well as new religions derived from African, African Brazilian and Japanese roots. His publications include Religion Defined and Explained 1993, with Peter Byrne), Japanese New Religions: In Global Perspective, New Religions in Global Perspective: A Study of Religious Change in the Modern World, the Encyclopedia of New Religious Movements, and The Oxford Handbook of the Sociology of Religion ; he is also the author and editor of another 20 books and 100 scholarly articles.
Definitions of religion
In Religion Defined and Explained, co-written with Peter Byrne, Clarke advocated an elastic definition of religion based on "family resemblance": while religions have "a characteristic set of features", "there will be no single feature or set of features found in each and every example of religion", and "there will be no limits to be set in advance to the kind of characteristic features newly discovered or developing religions might be found to exemplify, nor will there be absolute limits to the additional features such new examples could add to the set". Clarke and Byrne argued that "the various examples of religion will then be related by a network of relationships rather than shared possession of necessary and sufficient conditions for membership of the class." Even so, based on the family resemblance, "one will be able to say of newly found examples whether they are religions or not." In discussing Australian aboriginal and African "primal religions" in a chapter of The Illustrated Encyclopedia of World Religions, Clarke asserted that terms such as "primal" or "traditional" religions are "controversial", as they are often "wrongly taken to refer to static, unchanging and primitive, or unsophisticated religions found in underdeveloped societies"; Clarke made clear that he was not using the terms in this way, but used them in the sense of "religions that have always been an integral part of the culture of a society", unlike religions "with global ambitions such as Christianity and Islam".
Death
Clarke died on 24 June 2011, due to complications arising from deep-vein thrombosis. In view of his contributions to the field, a decision was made to retain his name as the editor of the Journal of Contemporary Religion until the end of the year 2011. The Sociology of Religion Study Group within the British Sociological Association renamed its 2012 postgraduate essay competition the 2012 Peter B. Clarke Memorial Prize.
