Daniel D. Isgrigg is associate professor of the history of Spirit-empowered Christianity at Oral Roberts University in Tulsa, Oklahoma. He is an ordained Assemblies of God minister...view moreDaniel D. Isgrigg is associate professor of the history of Spirit-empowered Christianity at Oral Roberts University in Tulsa, Oklahoma. He is an ordained Assemblies of God minister who spent twenty years in pastoral ministry.view less