- Has written for television series "Babylon 5", including episode #5.8 : "Day of the Dead" 3/11/1998
- Has written hundreds of comic book stories, most notably over 10 years worth of Incredible Hulk, 4 years of Aquaman (both reigns ended in late 1998, due to what could be labelled "creative differences"), his current work on Supergirl and Young Justice, and the mid-1980s limited series The Atlantis Chronicles (one of his personal favorites).
- Writes a weekly column titled "But I Digress", usually appearing on the final (inner) page of The Comic Buyer's Guide from Krause Publications. The money he earns for this column is automatically donated to the Comic Book Legal Defense Fund.
- Has appeared on QVC (late one night in early 1993).
- Novelization of Babylon 5: Thirdspace
- Novelization of Babylon 5: In the Beginning
- Novelization to Spider-Man (2002)
- Novelization to Hulk (2003)
- Battlestar Galactica (2004) novel "Sagittarius Is Bleeding"