(? - ) US teacher and author who began to publish work of genre interest with "World Enough and Time" in The Leading Edge for February 1997. His first novel, A Muse of Fire (2010 ebook), follows the childhood of a potential Superman on the colony planet of Mnemosyne (see Colonization of Other Worlds). Vale of Stars (2012) is a Generation Starship tale set partly on the long voyage from Earth, and partly, in a narrative spanning generations, on Epsilon Eridani III, where a complex mockery of First Contact has unpacked between the new arrivals and evolved humans who had left Earth long after the main cast, but who had arrived generations early in their Faster Than Light Starships (see Clichés). Beltrunner (2016 ebook) is a Hard SF novella set in the asteroid belt. Silent Manifest (2019) is a Space Opera set on a Starship freighting embryos to colonize an available planet.
O'Brien should not be confused with the UK poet and author Sean O'Brien (1952- ), some of whose short fiction and at least one collection have been ascribed to the subject of this entry; or with the Australian thriller writer, Sean Thomas O'Brien (1965- ); or with the UK Sean O'Brien, an academic associated with Birkbeck College, University of London, who has written on sf. [JC]
- A Muse of Fire (no place given: Writers Exchange E-Publishing, 2010) [na/Sandy Cummins and Laura Shinn]
- Vale of Stars (San Mateo, California: JournalStone, 2012) [pb/Jeff Miller]
- Beltrunner (Calgary, Alberta: Edge-Lite, 2016) [ebook: na/]
- Silent Manifest (Calgary, Alberta: Edge Science Fiction and Fantasy Publishing, 2019) [pb/100 Covers]