Witch Season
1. Summer (2004)
2. Fall (2004)
3. Winter (2005)
4. Spring (2005)
Witch Season: Summer and Fall (omnibus) (2007)
     aka Dark Vengeance Vol. 1: Summer, Fall
Witch Season 2: Winter and Spring (omnibus) (2008)

CVO
Covert Vampiric Operations (2004) (with Alex Garner)
CVO (2005)
Rogue State (2005)

Las Vegas
1. High Stakes Game (2006)
2. Sleight of Hand (2007)

The Slab (2003)
Dark Days (2004) (with Steve Niles and Ben Templesmith)
Shield: Spotlight (2004)
Underworld (2004) (with Cindy Chapman, Alex Garner, Nick Marinkovich, Kris Oprisko, Nick Postic and Robbie Robbins)
Boogeyman (2005)
Carnival Summer (2010)

Presidential Material Flipbook (2008) (with John Helfers)
Zombie Cop (2009)
Graveslinger (2009)
Terminator: Salvation (2009)
Angel: Smile Time (2009)
Barack Obama: The Comic Book Biography (2009)
Fade To Black (2010)

Gen 13
Netherwar (1999) (with Christopher Golden)
Time and Chance (2001) (with Scott Ciencin)
Gen13: Version 2.0 (2002)

Buffy the Vampire Slayer and Angel (with Nancy Holder)
1. The Burning (2001)
2. Door to Alternity (2001)
3. The Long Way Home (1999)
The Angel Casefiles (2002)

Star Trek : The Next Generation (with Kevin J Anderson and Rebecca Moesta)
The Gorn Crisis (2000)

Angel
4. Close to the Ground (2000)
6. Hollywood Noir (2001)
11. Haunted (2002)
13. Stranger to the Sun (2002)
15. Endangered Species (2002) (with Nancy Holder)
18. Sanctuary (2003)
19. Solitary Man (2003)
26. Love and Death (2004)
The Curse (2006)
Old Friends (2006)
Angel: Spotlight (2007) (with Peter David, Jay Faerber, Bob Gill, Dan Jolley, David Messina, Mike Norton, Mark Pennington and Scott Tipton)
Angel Omnibus Volume 1 (omnibus) (2008) (with Peter David)
Angel: The End (2011) (with Peter David and Bill Willingham)

Buffy the Vampire Slayer (Young Adult)
15. The Xander Years, Volume 2 (2000)

Star Trek : S. C. E. (with Greg Brodeur)
13. No Surrender (2002)

Buffy the Vampire Slayer (with Maryelizabeth Hart and Nancy Holder)
The Watcher's Guide Volume 2 (2003)

Charmed (with Constance M Burge)
19. Mirror Image (2003)
26. Survival of the Fittest (2004)

CSI: Crime Scene Investigation
12. Brass in Pocket (2009)
14. Blood Quantum (2010)
Thicker Than Blood (2003)
The Burning Season (2011)

Star Trek : The Lost Era
5. Deny Thy Father (2003)

CSI: Miami
8. Right to Die (2008)
Smoking Gun (2003)

Gene Roddenberry's Andromeda
5. The Attitude of Silence (2005)

Age of Conan : Marauders
1. Ghost of the Wall (2006)
2. Winds of the Wild Sea (2006)
3. Dawn of the Ice Bear (2006)

30 Days of Night
1. Rumors of the Undead (2006) (with Steve Niles)
2. Immortal Remains (2007) (with Steve Niles)
3. Eternal Damnation (2008) (with Steve Niles)
Light of Day (2009)

Supernatural
2. Witch's Canyon (2007)