"[1][2] From 1960 to 1975 he would serve in many abbey and congregational assignments, which included missionary trips and attending the Second Vatican Council as the secretary to the Archabbot of St. Ottilien.

The Ateneo had been in danger of closure due to falling enrollment, so Dammertz undertook visits to over 750 monasteries around the world to support the institution.

In addition, he was noted for his early development (with Abbess Máire Hickey of Dinklage Abbey) of the ‘’Communio Internationalis Benedictinarum’’ (CIB) that would later serve as the international association for women monastics.

Dammertz resigned as Abbot Primate in 1992, after which he was nominated by Pope John Paul II on 24 December 1992 as the next Bishop of the Diocese of Augsburg, Germany.

[6] He continued his life initially as a chaplain to a monastic community of sisters, but finally returned in 2018 to his home archabbey of St. Ottilien where he died peacefully on 7 March 2020.