A number of Sniegoski's works have been related to the Buffyverse, the fictional universe established by TV series, Buffy the Vampire Slayer and Angel.

Thomas has written and collaborated on comics since 1989. Some highlights include working on Vampirella, Punisher, and Batman. Stupid, Stupid Rat Tails was a prequel miniseries to fan favorite indie hit, Bone. Sniegoski collaborated with Bone creator Jeff Smith on the prequel, making him the only writer Smith has ever asked to work on those characters.

Sniegoski was the co-writer of the monthly Angel comic book series, based on the hit show, the Chaos! Comics mini-series Jade: Turn Loose the Dragon and its sequel Jade: Redemption, and fan favorite artist Randy Green's creator-owned series, The Dollz. He has written dozens of comics, including Batman Chronicles #22 and Wolverine/Punisher: Revelation and the Hellboy-inspired three issue mini-series, B.P.R.D: The Hollow Earth was co-written with Christopher Golden and Hellboy creator Mike Mignola. Other work with Golden includes Talent for Boom! Studios.

Tom has been working in the comic book field for ten years, for companies as diverse as Marvel, Image, Dark Horse, Acclaim, Harris, Crusade, Caliber, Spiderbaby, London Night, and most recently, Cartoon Books.

Other work includes Star Trek: Embrace the Wolf for Wildstorm, Batman: Real World for DC, Ghost, Razor, Shi and a Waterworld mini-series which was a sequel to the Universal film, also with Christopher Golden, and several Buffy the Vampire Slayer related projects for Dark Horse.

Buffyverse

• Soul Trade
• Earthly Possessions (with Christopher Golden)
• Hunting Ground (with Christopher Golden)
• Past Lives (with Christopher Golden)
• Giles (with Christopher Golden)
• Monster Island (with Christopher Golden)

Novels

• Force Majeure (with Christopher Golden) (Pocket Books, 2002)

The Fallen

• The Fallen (Pocket Books, 2003)
• Leviathan (Pocket Books, 2003)
• Aerie (Pocket Books, 2003)
• Reckoning (Pocket Books, 2004)
• There may, or may not be a 5th book. As of August, 2010, Thomas E. Sniegoski is currently in negotiations.

OUTCAST [w/Christopher Golden]

• The Un-Magician (Aladdin, 2004)
• Dragon Secrets (Aladdin, 2004)
• Ghostfire (Aladdin, 2005)
• Wurm War (Aladdin, 2005)

The Menagerie [w/Christopher Golden]

• The Nimble Man (Ace, 2004)
• The Tears of Furies (Ace, 2005)
• Stones Unturned (Ace, 2006)
• Crashing Paradise (Ace, 2007)

THE SLEEPER CONSPIRACY

• Sleeper Code (Razorbill, 2006)
• Sleeper Agenda (Razorbill, 2006)

OWLBOY

• Billy Hooten, Owlboy (Yearling, 2007)
• The Girl with the Destructo Touch (Yearling, 2007)
• The Terror of Zis-Boom-Bah (Yearling, 2008)
• The Flock of Fury (Yearling, 2008)

REMY CHANDLER

• A Kiss Before The Apocalypse (Roc, 2008)
• Dancing On The Head of a Pin (Roc, 2009)
• Where Angels Fear To Tread (Roc, 2010)

Comics

• Talent (with Christopher Golden, Boom! Studios, 2008)