Wiss, Janney, Elstner Associates, Inc. Wiss, Janney, Elstner Associates, Inc. (WJE) is a firm of structural engineers, architects, and materials scientists specializing in the investigation, analysis, testing, and design of repairs for historic and contemporary buildings and structures. WJE personnel are experienced in architectural, structural, and civil engineering, materials conservation, chemistry and petrography, as well as testing and instrumentation.