Damian Costello received his Ph.D. in theological studies from the University of Dayton and specializes in the intersection of Catholic theology, Indigenous spiritual traditions, and colonial history. He is an international expert on the life and legacy of Nicholas Black Elk and the author of Black Elk: Colonialism and Lakota Catholicism. Costello was born and raised in Vermont and his work is informed by five years of ethnographic work on the Navajo Nation.