In addition to his fiction, Brunner wrote poetry and published many unpaid articles in a variety of venues, particularly fanzines. He also published 13 letters to the "New Scientist" and an article about the educational relevance of science fiction in "Physics Education". Brunner was an active member of the organisation Campaign for Nuclear Disarmament and wrote the words to "The H-Bomb's Thunder", which was sung on the Aldermaston Marches. He was a linguist, translator, and Guest of Honour at the first European Science Fiction Convention "Eurocon-1" in Trieste in 1972.