Part of a prominent architectural family in Texas,[2] he designed or served as associate architect for many of Fort Worth's most notable buildings constructed during his working life.
During World War I, Geren was commissioned as a first lieutenant in the United States Army Corps of Engineers and fought in the battles of Saint-Mihiel and the Argonne, where he was wounded.
[2] At Sanguinet, Staats and Hedrick, Geren's projects included the Fort Worth Club, the Electric Building, the Texas and Pacific Passenger Terminal.
[3] Late in life, his firm was the local associate architect working with Louis Kahn on the Kimbell Art Museum.
(This was a common practice in Fort Worth with out-of-town architects, and Kahn had a reputation for significant time and cost overruns.