Gustave Steinback (1878-1959) graduated from Columbia University's School of Architecture in 1900. From 1904 to 1913, he worked in partnership with his Columbia classmate Robert J. Reiley. Many of Reiley & Steinback's clients were Roman Catholic parishes and dioceses. After the firm dissolved in 1913, both partners started their own practices, and continued their focus on Roman Catholic works.
FOSTER AV. - Hobart B. Upjohn, 456 4th av, Manhattan, has plans in progress for a church at the corner of Foster av and East 23d st for Flatbush Presbyterian Church, Rev. Herbert Field, pastor, 657 East 23d st, owner. Cost, $90,000. Architect will take bids on general contract in the spring. 1
Source: Real estate record and builders' guide: v. 109, no. 12: March 25, 1922