Dr. Lemna is the author of The Apocalypse of Wisdom (Angelico Press, 2019), a 2020 Catholic Press Association book award winner in the category of theological and philosophical studies.
He has published scholarly articles in numerous journals, including The Heythrop Journal, Nova et Vetera, Communio: International Catholic Review, International Philosophical Quarterly, Logos: A Journal of Catholic Thought and Culture, The Gregorianum, and Antiphon.
He has contributed to the revised edition of The New Catholic Encyclopedia and to The Encyclopedia of Catholic Social Thought, Social Science, and Social Policy, and has contributed a chapter to Jesus Christ: The New Face of Social Progress (Eerdman's, 2014).