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- Biography: Bio:John Helfers
- Bibliographic Comments: Author:John Helfers
- Shadowrun
- 45 Aftershock (2006) with Jean Rabe
- The Twilight Zone
- 3 Deep in the Dark (2004)
- Tom Clancy's Net Force Explorers
- 17 Cloak and Dagger (2001) with Russell Davis
- Siege of Night and Fire (2005)
- Fantastic (Greenberg Anthologies)
- Warrior Fantastic (2000) with Martin H. Greenberg
- Knight Fantastic (2002) with Martin H. Greenberg
- Black Cats and Broken Mirrors (1998) with Martin H. Greenberg
- Alien Abductions (1999) with Martin H. Greenberg
- Star Colonies (2000) with Martin H. Greenberg and Ed Gorman
- The Mutant Files (2001) with Martin H. Greenberg
- Villains Victorious (2001) with Martin H. Greenberg
- Once upon a Galaxy (2002) with Wil McCarthy and Martin H. Greenberg
- Space Stations (2004) with Martin H. Greenberg
- Little Red Riding Hood in the Big Bad City (2004) with Martin H. Greenberg
- In the Shadow of Evil (2005) with Martin H. Greenberg
- Slipstreams (2006) with Martin H. Greenberg
- Army of the Fantastic (2007) with John Marco
- Man vs. Machine (2007) with Martin H. Greenberg
- Future Americas (2008) with Martin H. Greenberg
- Barrayar
- The Vorkosigan Companion (2008) with Lillian Stewart Carl
- Valdemar
- The Valdemar Companion (2001) with Denise Little
- Star*Drive
- Unlikely Allies (1999)
- Blood Ghost (1996)
- Ghost in the Machine (1996)
- In the Forest of Sorrows (1997)
- Outside Looking In (1998)
- The Tenacity of the Dead (1998)
- Common Ground (1998)
- Serpent in the Garden (1998)
- Principles of Warfare (1998)
- A Boy and his Alien (1998)
- The Final Battle (1999)
- Hunters Hunted (1999)
- Savior (1999)
- Farewell to the Flesh (2000)
- Spirit of Honor (2001)
- Thieves in the Night (2002)
- Ghosts of Neptune (2002)
- Blood and Scale (2002)
- Hard Knocks (2003)
- Changeling (2004)
- Four Ends (2004)
- Fire in the Dark (2004)
- Afterward (2006)
- Stronger Than Fate (2007)
- One Time Around? (2007)
- Deathhand (2007)
- Ancestral armor (2007)
- Introduction (Black Cats and Broken Mirrors) (1998)
- Introduction (Future Crimes) (1999)
- Introduction (Alien Abductions) (1999)
- Introduction (Merlin) (1999)
- Introduction (Star Colonies) (2000)
- Introduction (Civil War Fantastic) (2000)
- Introduction (Warrior Fantastic) (2000)
- Introduction (Villains Victorious) (2001)
- Introduction (The Mutant Files) (2001)
- Introduction (Knight Fantastic) (2002)
- Introduction (Little Red Riding Hood in the Big Bad City) (2004)
- Introduction (All Hell Breaking Loose) (2005)
- Introduction (Gateways) (2005)
- Introduction (Slipstreams) (2006)
- About the Authors (2007) with John Marco
- Introduction (Man vs. Machine) (2007)
- A Conversation with Toni Weisskopf (2008)
- The Vorkosigan Saga Novel Summaries (2008)
- The Vorkosigan Saga Concordance (2008) with Kerrie Hughes and Ed Burkhead