Sister Mary spent most of her teaching career in colleges and universities. Her ministry included serving as director in the department of theology and liturgical studies at Catholic University and as chair of the department of religious studies at Mount Saint Scholastica College and Benedictine College.
She served on the advisory committee for the International Commission on English in the Liturgy, as editor of Worship, co-editor of Concilium: An Interntional Journal of Theology, and theological consultant on several Federation of St. Scholastica booklets, including Upon This Tradition. She wrote several books and numerous articles.
She served one term as prioress of the Mount community and first councilor for the Federation of St. Scholastica for three terms.
She currently lives in Dooley Center.