Robert J. Reiley practiced under his own name from 1913 until 1952 when he took his son,
Robert J. Reiley Jr. into partnership and renamed the firm
Robert J. Reiley & Associates. His main client remained the
Roman Catholic Archdiocese of New York for which he designed a number of churches and associated structures. His office was located at 50 East 41 Street from the 1920s and 45 West 45th Street in the 1950s. During his career, he was licensed to practice architecture in New York, New Jersey, Connecticut, Pennsylvania, North Carolina, and the District of Columbia. The firm had a staff of around twenty and banked with the
Guaranty Trust Company, Fifth Avenue and 44th Street, New York City. Several later noteworthy architects began their careers in his office including Louis M. Thorn and Brother Cajetan Baumann, OFM (1899–1969), a Franciscan who was to design many modern buildings mostly for Franciscan clients in the middle part of the 20th century. ==Personal life==