His Grace the Right Reverend John (Martin) of Nyssa was the second ruling bishop of the American Carpatho-Russian Orthodox Diocese (ACROD). His episcopacy was cut short by his early death. Fr. John R. Martin was appointed on August 16, 1966, as auxiliary bishop to Metr. Orestes, with the title of titular bishop of Nyssa, by the Holy Synod of the Ecumenical Patriarchate. His consecration was on October 6, 1966, at Christ the Saviour Cathedral in Johnstown, Pennsylvania. The consecrating bishops were led by Abp. Iakovas, of the Greek Orthodox Archdiocese of North and South America, along with Metr. Orestes and Bishop Theodosios.