Originally from Vietnam, Thien came to Australia in 1998 to pursue his academic and religious training. He was ordained priest with the Society of the Divine Word (SVD) in the Roman Catholic Church in 2004. Interested in studies of religions and cultures, Thien has been committedly involved in interreligious dialogue studies and intercultural activities. Thien completed a PhD in religious studies from Monash University in 2020. He lectures at YTU on Interreligious Dialogue and Comparative Study of Religions.