Piero Marini was ordained on June 27, 1965. He became the personal secretary for Archbishop Annibale Bugnini in 1975 and in 1982 was appointed the head of the Office for the Liturgical Celebrations of the Supreme Pontiff, a position he currently holds. In 1998, Marini was appointed Titular Bishop of Martirano, Italy, and was ordained bishop the following month. In 2003, Marini was appointed Titular Archbishop of Martirano. He also serves as the Master of Pontifical Liturgical Celebrations.