Author of over sixty published short stories and eighteen novels, including the Books of the Change and The Resurrected Man, his work has been published around the world in numerous languages, on-line, and in spoken word editions. He is currently completing the fourth book of his second fantasy series, the Books of the Cataclysm, and has just sold Astropolis, a solo space opera trilogy, into the US and UK

His science fiction has been likened to that of the "Three Gregs" (Benford, Bear and Egan) while his fantasy has garnered comparisons to Peter Carey and Ursula K. Le Guin. His novel The Crooked Letter was the first fantasy novel in the history of Australian speculative fiction to win both Ditmar and Aurealis Awards.

With collaborator Shane Dix, he produced the Evergence, Orphans and Geodesica series and co-wrote the Star Wars: New Jedi Order: Force Heretic trilogy. Together, they have been called "the new Niven & Pournelle for the 21st century" and were recently "Thogged" in Ansible.

A multiple recipient of both the Ditmar & Aurealis Awards (including a nomination for the Professional Achievement category of the Ditmar in 2005), Sean Williams has written reviews, music (for which he won a Young Composer's Award in 1984), a stage play, and the odd haiku.

He lives in Adelaide -- a town once portrayed by Salman Rushdie as "an ideal setting for a Stephen King novel" and by Jules Verne as the prettiest city in Australia -- where he is completing a Masters in Creative Writing at Adelaide University. He is a committee member of the award-winning Big Book Club, a judge in the Writers of the Future contest, and a former Chair of the SA Writers' Centre. He has been a peer assessor for the Literature Board of the Australia Council and a judge for the Aurealis Awards, tutored for Clarion South in 2005, and was recently made an honorary member of the International Golden Key Honour Society. He has been a guest of all the literary festivals of Australian capital cities (some of them more than once) and various National SF Conventions. His name appears on the Celebrity Atheist List.

He DJs and cooks curries less frequently than he used to, but still likes mentioning them in his bio.