Novels[]
- 1998 – Gargantua as by K. Robert Andreassi
- 2002 – Darkness Falls
Buffy the Vampire Slayer[]
Resident Evil[]
- 2004 – Resident Evil: Genesis
- 2004 – Resident Evil: Apocalypse
- 2007 – Resident Evil: Extinction
Supernatural[]
- 2007 – Supernatural: Nevermore
- 2008 – Supernatural: Bone Key
- 2010 – Supernatural: Heart of the Dragon
Collections[]
Novelettes[]
- 1999 – Buffy the Vampire Slayer: Teacher's Pet
- 1999 – Buffy the Vampire Slayer: Inca Mummy Girl
- 1999 – Buffy the Vampire Slayer: Bewitched, Bothered and Bewildered
Short Stories[]
- 2017 – Deep Background