His first published short story, "The Spectre General" in the magazine Astounding (June 1952), was a humorous tale in which a long-forgotten maintenance brigade of the Imperial Space Marines has the potential of reinvigorating a declining Galactic empire. Cogswell wrote almost 40 science fiction stories, most of them humorous, and was co-author of a novel of the Star Trek franchise.
Cogswell was also the editor of the long-running "fanzine for pros", Proceedings of the Institute for Twenty-First Century Studies, a collection of which was published during 1993. In this, writers and editors discussed their and each other's works.
- The Wall Around the World (1962) (short stories)
- The Third Eye (1968) (short stories)
- Spock, Messiah! (1976) (Star Trek novel with Charles A. Spano, Jr.)
- The Friggin Falcon (1966) (poem)
- PITFCS: Proceedings of the Institute for Twenty-First Century Studies (1993)