Donald Wallenfang, OCDS, Emmanuel Mary of the Cross, is Professor of Theology and Philosophy at Sacred Heart Major Seminary in Detroit. He is the author and editor of several books, including Shoeless: Carmelite Spirituality in a Disquieted World (Wipf & Stock, 2021), Phenomenology: A Basic Introduction in the Light of Jesus Christ (Cascade, 2019), Metaphysics: A Basic Introduction in a Christian Key (Cascade, 2019), Human and Divine Being: A Study on the Theological Anthropology of Edith Stein (Cascade, 2017), and Dialectical Anatomy of the Eucharist: An Étude in Phenomenology (Cascade, 2017).