Born in Milwaukee, Wisconsin, Grellinger entered Saint Francis Seminary in Milwaukee in 1922.[1] He was ordained to the priesthood in Rome on July 14, 1929.[1] On May 16, 1949, Pope Pius XII appointed Grellinger auxiliary bishop of the Green Bay Diocese and he was consecrated on July 14, 1949.[1][2] Bishop Grellinger retired on September 21, 1974.[3]
