He completed his novitiate at Bedford, Massachusetts, and his studies for the priesthood in New York before being ordained a priest for Maryknoll on February 7, 1943.
Gerbermann was appointed the Titular Bishop of Amathus in Palaestina on June 6, 1962, and he was consecrated by Archbishop Ambrogio Marchioni, the Apostolic Nuncio to El Salvador and Guatemala, on July 22, 1962.
The principal co-consecrators were Archbishop Mariano Rossell y Arellano, the Prelate of Esquipulas, and Bishop Celestino Miguel Fernández Pérez, O.F.M.
[1] He served the archdiocese as an auxiliary bishop until Pope John Paul II accepted his resignation on June 30, 1982.
In his retirement he resided at St. Mary’s Parish in his native Nada and assisted local priests with their pastoral responsibilities.