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Campbell's main research work is on Second Temple Judaism in general and on the Dead Sea Scrolls from Qumran in particular. Because these Scrolls have such important repercussions across several interrelated disciplines, he is also interested in the emergence of both Rabbinic Judaism and Christianity out of the Judaism of the Second Temple period (circa 515 BCE - 70 CE). He has further interests in the theological impact of academic study of the Bible and of Jewish and Christian history on Judaism and Christianity in the contemporary world.
'New Directions in Qumran Studies: Proceedings from the Bristol Colloquium on the Dead Sea Scrolls, 8-10th - September 2003' (London: Continuum, Forthcoming in 2005); co-edited with W.J. Lyons and L.K. Pietersen.
'The Exegetical Texts' (CQS 4: London: T & T Clark International, 2004).
'Zwoje Znad Morza Martwego Rozszyfrowane' (Warsaw: Amber Books, 1998).
'Deciphering the Dead Sea Scrolls' (1st edition; London: HarperCollins, 1996).
'Deciphering the Dead Sea Scrolls' (2nd edition. Oxford: Blackwell, 2002).
'The Use of Scripture in the Damascus Document 1-8, 19-20' (Berlin: de Gruyter, 1995).