Marini was named Master of Pontifical Liturgical Ceremonies on 1 October 2007, appointed to another five-year term by Benedict XVI, confirmed in that office by Pope Francis in April 2014, and appointed to another five-year term in 2017. Following his appointment as Master of Pontifical Liturgical Celebrations, the Papal Altar was rearranged with the seven candles and crucifix placed in a line across the altar rather than clustered on the sides. Discussing the changes he was implementing he said that compared to the liturgies celebrated under his predecessor, "now there is a different style, one that is more sober and more attentive to the essential things". In a January 2010 speech, Marini supported calls in the Church for a "reform of the reform" of the liturgy. He said: "For some years now, several voices have been heard within Church circles talking about the necessity of a new liturgical renewal," adding that a new renewal movement would be "capable of operating a reform of the reform, or rather, move one more step ahead in understanding the authentic spirit of the liturgy and its celebration." In 2015 Pope Francis made changes to the public ceremony of investiture of the
pallium on metropolitan archbishops emphasizing that the investiture is an ecclesial event of the whole diocese, and not merely a juridical or ceremonial event. Marini said that from now on – starting from 29 June 2015 – the ceremony of investiture of the pallium will take place in each metropolitan archbishop's home diocese and not in the Vatican. (This has since, under Pope Leo in 2025, reverted to the earlier practice.) Marini also made decisions about the use of
vestments at Mass and other pontifical celebrations, dressing
cardinal deacons in
dalmatics when serving at pontifical celebrations. In 2019, Pope Francis made Marini's office responsible for the
Sistine Chapel Choir, which until then operated independently within the papal household. From the time of his priestly ordination, first in Genoa and then in Rome, he preached and provided spiritual direction, at times working with youth groups and communities of religious. The next day, after the cardinal-electors had taken their oath in the
Sistine Chapel, Marini called out the command "
Extra omnes" (Everyone out) and closed the chapel doors once all outsiders had left the chapel. ==Bishop==