Greg is the author of Leslie Marmon Silko, a study of the prominent Laguna Pueblo writer's work, and the co-editor of Literature and Theology at Century's End. He has published many essays and given numerous presentations on Native American literature, contemporary fiction, and literature and religion. He received his Ph.D. from Emory University in literary theory, contemporary fiction, and religious studies. Greg has chaired many departments and directed several programs. He has been teaching online since 2000.