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His other buildings include Tollpakkhuset (customs house), Kommandantboligen (Commanders living quarters at Akershus festning), De naturhistoriske samlinger (Bergen Museum), and reconstructions on Heddal stavkirke, Telemark (1851).
Brunchorst specialised in botany at university, and after finishing his Ph.D. in Germany, he became director of Bergen Museum.
He was scientific assistant and university lecturer at Department of Limnology, University of Oslo, from 1960 to 1966; research scientist at Freshwater Institute, Winnipeg, Manitoba, Canada from 1966-1977; and professor of systematic zoology in the Museum of Zoology at the University of Bergen from 1977 to his retirement in 2006.He specialized in aquatic Diptera, especially Chironomidae and Chaoboridae.