Until her retirement, she taught classes in spirituality for the Seminary of the Southwest in Austin, Texas. Mary has authored nine books; the subjects include the spirituality of living with illness, rule of life, Celtic Christian spirituality, the Desert Mothers, and Julian of Norwich. Mary has offered presentations and retreats in a variety of ecumenical settings, including conferences of the Academy for Spiritual Formation, Spiritual Directors International, the International Thomas Merton Society and hospice organizations. She has written articles for a variety of journals, including Presence: the Journal of Spiritual Directors International, Radical Grace, Reflections, and The Lutheran. She was included in the Living Spiritual Teachers project of Spirituality and Practice.