Campbell retired as associate professor of biblical studies at Belhaven College in Belhaven, Mississippi. He earned the M.A. in 1967 at Aberdeen University, the B.D. in 1970 and Th.M. in 1971--both at Westminster Theological Seminary, and the Ph.D. in 1975 at the University of Manchester (where his supervisor was F. F. Bruce). In addition to teaching, Campbell has served as pastor of several churches in England, New York and Mississippi. His publications include The Credible Church (Bibal Press, 1999) and Our Awesome God (Christian Focus Publications, 1997). He has also written articles for journals such as Evangelical Quarterly, Scottish Journal of Theology and Journal of the Evangelical Theological Society.