Mauran, Russell & Crowell was an American architectural firm active in St. Louis from 1900 until 1989 under several different names. Founded in 1900 as Mauran, Russell & Garden, in 1911 it evolved into Mauran, Russell & Crowell, under which name it did its most notable work. After the deaths of founders John Lawrence Mauran and Ernest John Russell in 1933 and 1956, respectively, the firm was continued by their former partners, W. Oscar Mullgardt, Arthur F. Schwarz Jr. and Hari van Hoefen under the names Russell, Mullgardt, Schwarz & van Hoefen and after 1960 as Schwarz & van Hoefen. In 1968 they were joined as partner by Richard T. Henmi, and in 1969, after the departure of van Hoefen, the firm became Schwarz & Henmi. Schwarz died in 1971 and the firm was thereafter led by Henmi until its sale in 1989.