Brunvoll did not continue his military career after World War II. In 1945 he established his own impresario and concert agency. The agency introduced strongmen, illusionists and performing artists. Among the artists were opera singers Aase Nordmo Løvberg and Ragnar Ulfung, and singer-songwriter Alf Prøysen. Brunvoll co-founded the Norwegian Opera Company in 1949, along with his brother Jonas and István Pajor, and directed this company from 1949 to 1958. He served as manager at Den Norske Opera from 1958 to 1979.[1][5] He was a board member of the International Association of Opera Directors from 1962 to 1965, and chairman of the board of the Norwegian National Academy of Opera from 1988 to 1992.[1] He was vice chairman of Norsk Film from 1965 to 1971.[6] He was decorated Commander of the Order of the Polar Star, Knight, First Class of the Order of St. Olav, and Knight of the Order of Dannebrog.[1]