[1] A recipient of the Pro Ecclesia et Pontifice, he is the former Archivist, Spanish Department Director, Prefect of Libraries, and professor at the Pontifical and Royal University of Santo Tomas.
[1][2][3] He is also known as the most-prolific saint-maker in the Philippines for his Positio Super Introductione Causae, or historical research, that he made for the beatification and canonization of Lorenzo Ruiz and fifteen other companion-martyrs.
[1][2] In highschool, he was inspired to become a priest by his teachers at the Dominican schools of La Mejorada and Santa Maria de Nieva.
He also authored the Positio Super Introductione Causae or cause of beatification leading to the canonization of San Lorenzo Ruiz and his companion martyrs.
[3] In 2009, Villarroel was installed as Master of Sacred Theology, an honorary title once held by St. Dominic de Guzman, given by the Dominican Order to its most distinguished scholars.