Mauro Gagliardi, S.T.D, a priest of the Archdiocese of Salerno (Italy), is a Professor at the Pontifical Athenaeum Regina Apostolorum and Visiting Professor at the Angelicum. Fr. Gagliardi has also taught as a Visiting Professor in Spain and the United States. Pope Benedict XVI appointed him as Consultor to the Office for the Liturgical Celebrations of the Supreme Pontiff and Consultor to the Congregation for Divine Worship and the Discipline of the Sacraments. Fr. Gagliardi has authored ten books and is the editor or co-author of another seven.