Nin was born on August 20, 1956, in the town of El Vendrell in the Catalan province of Tarragona (Spain).

He completed his coursework in 1987 and returned to his monastic community, where he was assigned to teach theology, patristics and an introduction to the Eastern Christian liturgy at his alma mater.

He completed his study of a Greek spiritual writer of the 5th or 6th century, titled John the Solitary: The Five Discourses on the Beatitudes, in late 1991 and successfully defended it the following January.

In January 1996, while still a religious brother, he was appointed to the staff of the Pontifical Greek College of Saint Athanasius as a spiritual director for the school, where he then took up residence.

[2] On 2 February 2016, Nin was appointed as Apostolic Exarch of Greece by Pope Francis, at the same time, being named the Titular Bishop of Carcabia.