He wrote a book on the city's medieval history and founded the local branch of the Society for the Preservation of Ancient Norwegian Monuments.
It was saved from destruction by the Society for the Preservation of Ancient Norwegian Monuments, which bought the materials with the intention of re-erecting the church elsewhere.
In 1974, Bull's granddaughter Sylvea Bull Curtis of Connecticut donated the island to the Society for the Preservation of Ancient Norwegian Monuments.
He also chaired the organization Norske Museers Landsforbund, a forerunner of Norges Museumsforbund, from 1949 to 1957, and the Society for the Preservation of Ancient Norwegian Monuments in Bergen from 1949 to 1960.
Tschudi-Madsen was member of the Norwegian Academy of Science and Letters (1965) and Honorary Member of the Society for the Preservation of Ancient Norwegian Monuments (1983) and Honorary Member of ICOMOS (1992).
It has been owned by Fortidsminneforeningen (Society for the Preservation of Norwegian Ancient Monuments) since 1881.
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