Barnett, Haynes & Barnett was a prominent architectural firm based in St. Louis, Missouri. Their credits include many familiar St. Louis landmarks, especially a number related to the local Catholic church. Their best-known building is probably the Cathedral Basilica of St. Louis (the 'new' cathedral). A number of the firm's works are listed on the U.S. National Register of Historic Places. The three partners were Thomas P. Barnett, John Ignatius Haynes, and George Dennis Barnett. The Barnetts were sons of English-born St. Louis architect George I. Barnett, and Haynes was George D. Barnett's wife's brother. The founding of the firm dates to about 1895; George D. Barnett died in 1922, and the last structure attributed to the firm dates to about 1930. Work Their designs include: Rockcliffe Mansion, 1000 Bird St., Hannibal, Missouri, 1898–1900 (Barnett, Haynes & Barnett), NRHP-listed Kingsbury Place, private place entry gates and three of the mansions (#3, #7, and #11), 1902 Loretto Academy, Kansas City, Missouri, 1902 Palace of Liberal Arts, Louisiana Purchase Exposition, St. Louis, 1904 (temporary) Hotel Jefferson, 415 N. Tucker Blvd. St. Louis, MO, 1904 (Barnett, Haynes & Barnett), NRHP-listed St. Ann's Orphan Asylum, St. Louis, 1904 (razed circa 1978) Mark Twain Hotel, 200 S. Main St. Hannibal, MO, 1905 (Barnett, Haynes & Barnett), NRHP-listed St. John's Mercy Hospital Building, 620 W. Scott Springfield, MO, 1906 (razed circa 1970) (Barnett, Haynes and Barnett, et al.), NRHP-listed Bank of New York Building, New York, 1907 (razed 1932) Marquette Hotel, 1734 Washington Ave. St. Louis, MO, 1907, NRHP-listed Connor Hotel, Joplin, Missouri, 1908 Himmelberger and Harrison Building, 400 Broadway Cape Girardeau, MO, 1908 (Barnett, Haynes and Barnett), NRHP-listed Immaculate Conception / St. Henry's Church, St. Louis, 1908 Congregation Temple Israel, one of the institutions at the Holy Corners Historic District, St. Louis, 1908 Illinois Athletic Club, 112 S. Michigan Avenue, Chicago, 1908 Connor Hotel, Joplin, Missouri, 1908 Hotel Stratford, 229 Market St. Alton, IL, 1909 (Barnett, Haynes & Barnett), NRHP-listed the former Loretto Academy, 3407 Lafayette Avenue, St. Louis, MO, 1909 (Barnett, Haynes & Barnett), NRHP-listed Lenox Hall, University City, St. Louis, 1910 Adolphus Hotel, 1315 Commerce St. Dallas, TX, 1912 (Barnett, Haynes and Barnett), NRHP-listed Brockman Building, 520 W. 7th St. and 708 S. Grand Ave. Los Angeles, CA, 1912 (Barnett, Haynes and Barnett), NRHP-listed Cathedral Basilica of St. Louis, St. Louis, 1912 Busch Mausoleum, Bellefontaine Cemetery, St. Louis, 1915 Post-Dispatch building, 1139 Olive