Horan taught in the Department of Religious Studies at
Siena College in
Loudonville,
New York, and summer courses in the Department of Theology at
St. Bonaventure University, the School of Theology and Ministry at
Boston College, and at
Catholic Theological Union. He serves on the Board of Trustees of
St. Bonaventure University and the Board of Regents of
Franciscan School of Theology. He previously served several terms on the International Thomas Merton Society Board of Directors and is a former columnist at
America. Horan has written on Franciscan theology,
philosophy, and
spirituality as well as given lectures and delivered academic papers (around the United States, Canada, and Europe) on the theological and social significance of the work of
Thomas Merton. He has also given workshops and delivered lectures on the intersection of the millennial generation and spirituality. His current work focuses on postmodern thought and the use of medieval Franciscan thinkers like
John Duns Scotus as well as the authentic retrieval of their thought for contemporary theological inquiry; the life, work and thought of Thomas Merton; and contemporary systematic and constructive theologies. Horan has spoken publicly on theological matters related to justice and inclusion in support of the LGBTQ+ community in the Catholic Church and society, including offering scholarly supported criticism of USCCB statements. Additionally, Horan has advocated for a number of other justice issues in academic and popular venues, including in response to the global
climate crisis,
ecospirituality, and
antiracism. On October 3, 2024, Horan announced that he would be leaving the Franciscan order and ministry as a priest, and would be petitioning the Holy See for a dispensation from the rights and obligations of the clerical state ("
laicization"). == References ==