Joshua Glenn is a consulting semiotician and editor of the websites HiLobrow and Semiovox. The first to describe 1900–1935 as science fiction's “Radium Age,” he is editor of the MIT Press's series of reissued proto-sf stories from that period. He is coauthor and coeditor of various books including the family activities guide Unbored (2012), The Adventurer's Glossary (2021), and Lost Objects (2022). In the 1990s, he published the indie intellectual journal Hermenaut.