[2] Munthe was secretary of the Stockholm Beauty Council in 1924 and worked as curator and head of the Röhsska Craft Art Museum in Gothenburg from 1924 to 1945.
[1] He was art history teacher at the seminar of the Handarbetsvännerna ("Friends of the Artisanry") from 1921 to 1924 and a member of the International Jury at the Paris Exhibition in 1925.
He was captain in a group of Norwegian and Swedish soldiers and radio technicians who brought a convoy of four military vehicles across the border to Norway.
[7] Munthe would later in life write the book Tennsoldaten : minnen från krigsåren ("The Tin Soldier : memories of the war years") (1960) about his wartime experiences.
[5] Munthe was CEO of Svenska turisttrafikförbundet ("Swedish Tourist Traffic Association") from 1944 to 1951[8] and after that he headed the Children's Day in Stockholm from 1952 to 1955.
[1] Munthe was also a member, board member and chairman of a number of associations, companies, foundations, guilds and societies; board member of the Swedish Exhibition and Congress Centre 1928-1951,[8] of the Stockholm Exhibition in 1930,[3] of Svenska slöjdföreningen (Swedish Sloyd Association) 1931-1943 and 1944-1946 (chairman of the union section),[8] of the Sweden–America Foundation's Zorn Scholarship 1929-1930,[3] of the Gothenburg City Theatre 1935-1945,[8] of the AB Gbgssystemet 1938-1945,[8] of the Svenska hemslöjdsföreningens riksförbund ("Swedish National Home Sloyd Association") 1945-1950[9] and of the Drottningholm Theatre Museum from 1945.;[8] member of the Swedish Handicraft Association 1945-1947,[8] of the Svenska orientsällskapet ("Swedish Orient Society") from 1950,[8] of the Svensk-italienska sällskapet ("Swedish-Italian Society") from 1952,[8] of the Konsthantverkarnas gille ("Artisans' Guild") 1952-1958,[1] of the Foundation Natur & Kultur 1952,[8] of the Statens kommitté för social upplysning ("State Committee for Social Enlightenment") in 1946[1] and of the Tourist Investigation at the Ministry of Trade in 1948;[1] chairman of the Humanist Department of Stockholm University College Student Union from 1918-1920,[2] of the Stockholm Federation of Student Unions in 1924,[3] of the Föreningen Göteborgs konsthantverkare ("Association of Gothenburg's Artisans") 1929-1945,[1] of the Stockholm University College Student Union 1923-1924,[3] of the Svensk-Jugoslaviska Sällskapet i Göteborg ("Swedish-Yugoslav Society in Gothenburg") from 1939,[4] of the Swedish Tourist Association's Gothenburg Board 1938-1943[8] and of the Föreningen Konstfliten-Bohusslöjd ("Handicraft-Bohuslän Sloyd Association") 1940-1944.;[8] vice chairman of the Svensk-Pakistanska vänskapsföreningen ("Swedish-Pakistani Friendship Association") from 1953.