He was born the son of Gabriel Godfrey Aas and Sophie Schroeder in Haugesund in the county of Rogaland, Norway. He was educated at the Bergen Technical School (now Norwegian University of Science and Technology (1879). He graduated from the Technical University of Munich (1882). He was then hired in the Norwegian Directorate of Public Roads as an assistant to Road Director Hans Hagerup Krag, but left for the United States in 1883. Initially he was employed by railroad and highway bridge designer Theodore Cooper.
Having worked in different companies, including the Phoenix Bridge Company, he was hired as chief engineer in the United States Department of the Treasury. In 1902, he started his own consulting business in New York City. The Gusvald Aus Company completed the engineering work for a number of projects including Harkness Memorial Quadrangle at Yale University, the Minnesota State Capitol in St. Paul and the Library building at Northwestern University. Together is Kort Berle, he later was involved in the construction of the Woolworth Building.
He had become an American citizen in 1892 but in 1915 he returned to Norway. He served for a period as a local politician in Asker. He was a member of the district government from 1923–1928. He died in Asker in 1950.
- "Aus, Gunvald". Aschehoug og Gyldendals Store norske leksikon. Kunnskapsforlaget. 2007.
- Saga in Steel and Concrete – Norwegian Engineers in America (Kenneth Bjork. Northfield, Minnesota: Norwegian-American Historical Association. 1947)
- Engineering Design of the Woolworth Building (American Architect. nr. 2. pages 157–170. 1913)
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