General Info Established in 1963, GLHN Architects and Engineers Inc. is a provider of integrated, multi-discipline services in architecture, mechanical, electrical and civil engineering. Based in Tucson, Ariz., the company offers expertise in campus utility master planning, underground utility systems/buried pipe, medical/laboratory design and large-scale municipal vehicle maintenance facilities. In addition, it provides low-energy electron diffraction (LEED)/sustainable designs and systems commissioning. The firm is also developing a specialization in the design of alternative fuel facilities, like E85 stations and campus solar energy. It serves higher education, federal government, municipal and transportation sectors.