After completing his doctoral work at Oxford University, he published his thesis on Richard of St. Victor under the title, ‘Per visibilia ad invisibilia’: Theological Method in Richard of St. Victor (d. 1173) (Brepols, 2006). He is also part of an editorial team overseeing the translation of a number of works from the twelfth-century Abbey of St. Victor, and is currently at work on his second project dealing with the thought of Richard of St. Victor. In addition to his work on the Middle Ages, as the theology interest group leader for the Society for Pentecostal Studies, Coulter also actively contributes to ecumenical discussions between Pentecostals and Catholics.