Novels

The Iron Thane, Baen Books, 1993. ISBN 978-0-671-72203-6
The Spawn of Loki, Baen Books, 1995. ISBN 978-1-55594-073-7
Highlander: the Element of Fire, Warner Aspect Books, 1995. ISBN 978-0-446-60283-9
The Incredible Hulk: Abominations, Berkley Books, 1997. ISBN 978-1-57297-273-5
X-Men/Spider-Man: Time’s Arrow, Book 1 (with Tom DeFalco), Berkley Books, 1998. ISBN 978-0-425-16452-5
The Darkling Band, Dragon Moon Press, 2007. ISBN 978-1-896944-36-4
Alex Van Helsing: Vampire Rising, HarperCollins, 2010. ISBN 978-0-06-195099-5
Alex Van Helsing: Voice of the Undead, HarperCollins, 2011. ISBN 978-0-06-195101-5
Alex Van Helsing: The Triumph of Death, HarperCollins, 2012. ISBN 978-0061951039

Young Captain Nemo, Macmillan Children's, 2019

Quest for the Nautilus: Young Captain Nemo, Macmillan Children's, 2020

 

​Graphic Novels
Soulcatcher, Alias Comics, 2005. ISBN 978-1-933428-04-8
Vampire The Masquerade Volume 3: Blood and Loyalty (with Bryan Edwards, Mike Reynolds, Chris Marrinan, Steve Ellis), White Wolf, 2003. ISBN 0-9726443-8-5
Sword of Dracula, IDW Comics, 2005. ISBN 978-1-932382-70-9
Psy-Comm, Volume 1 (with Tony Salvaggio), Tokyopop, 2005. ISBN 978-1-59816-269-1
Psy-Comm, Volume 2 (with Tony Salvaggio), Tokyopop, 2007. ISBN 978-1-59816-270-7
Psy-Comm, Volume 1: Kaplan SAT/ACT Vocabulary-Building Manga (with Tony Salvaggio), Tokyopop, 2007. ISBN 978-1-4277-5496-7
Clockwerx, Tome 1: Genese (with Tony Salvaggio), Humanoids, 2008. ISBN 978-2-7316-1933-1
Hulk: Broken Worlds (with various), Marvel Comics, 2009. ISBN 978-0-7851-4182-2
Clockwerx, Tome 2: Deluge (with Tony Salvaggio), Humanoids, 2009. ISBN 978-2-7316-2255-3
What If: Dark Reign, Marvel Comics, 2011. ISBN 978-0-7851-5278-1
Shadowland: Street Heroes, (with various), Marvel Comics, 2011. ISBN 978-0-7851-4887-6
Psy-Comm, Volume 3 (with Tony Salvaggio), Tokyopop/Right Stuf, 2012. ISBN 978-1427821935