Tirres has a longstanding interest in three quintessential American traditions: Latin American liberation theology, U.S. Latino/a theology, and U.S. pragmatism. He explores their intersection in his first book, The Aesthetics and Ethics of Faith: A Dialogue between Liberationist and Pragmatic Thought (Oxford University Press, 2014). He is currently at work on his second book, tentatively entitled "Liberating Spiritualities Across the Latinx Americas: Spiritual-Philosophical Profiles." Tirres is a member of the Society for the Advancement of American Philosophy (SAAP), the Academy of Catholic Hispanic Theologians of the U.S. (ACHTUS), and the American Academy of Religion (AAR), in which he serves as co-chair of the Religions in the Latina/o Americas Unit. He is also a volunteer with the Interfaith Committee for Detained Immigrants (ICDI).