Walter Philip Kellenberg (June 3, 1901 – January 11, 1986) was an American prelate of the Roman Catholic Church. He served as bishop of the Diocese of Ogdensburg in Northern New York (1954–1957) and bishop of the Diocese of Rockville Centre in New York (1957–1976). Biography Early life Walter Kellenberg was born in the Bronx, New York, to Conrad and Elizabeth (née Kern) Kellenberg. He received his early education at the parochial school of St. Anthony of Padua Parish in Bronx, New York. He then attended Fordham Preparatory School in the Bronx and Cathedral College in Queens, New York. Kellenberg made his theological studies at St. Joseph's Seminary in Yonkers, New York. He also took courses in real estate, insurance, and business administration at Columbia University. Priesthood Kellenberg was ordained to the priesthood on June 2, 1928. His first assignment was as a curate at St. Mary's Parish in the Rosebank neighborhood of Staten Island, New York for six years. In 1934, he was transferred to St. Paul's Parish in Manhattan and appointed to the archdiocesan curia. Within a year, Kellenberg became a curate at St. Patrick's Cathedral Parish, and was named assistant chancellor and secretary of the archdiocesan Commission for Real Estate and Insurance in 1939. Kellenberg became temporary administrator of St. John the Baptist Parish in Staten Island. and St. Nicholas Parish in Manhattan, and was named vice-chancellor in 1942. He was named a papal chamberlain in 1943, and served as secretary to Cardinal Francis Spellman from 1947 to 1950. He was later made chancellor (1947), domestic prelate (1948), and moderator of the coordinating committee of the Archdiocesan Catholic Lay Organization (1951). Auxiliary Bishop of New York On August 25, 1953, Kellenberg was appointed auxiliary bishop of New York and titular bishop of Ioannina by Pope Pius XII. He received his episcopal consecration on the following October 5 from Cardinal James McIntyre, with Bishops William Scully and Joseph Flannelly serving as co-consecrators. Bishop of Ogdensburg Following the transfer of Bishop Bryan McEntegart to the Catholic University of America, Kellenberg was named the sixth bishop of the Diocese of Ogdensburg on January 19, 1954. That same year, he received an honorary degree from Fordham University. He expanded the diocese's Departments of Education and Catechetics and increased the number of parochial schools. Bishop of Rockville Centre He remained in Ogdensburg for three years, when he was appointed the first Bishop