Chronicles of Galen Sword (with Judith Reeves-Stevens)
1. Shifter (1990)
2. Nightfeeder (1991)
3. Dark Hunter (2003)

Bloodshift (1981)
Dreamland (1985)
Children of the Shroud (1987)
Nighteyes (1989)
Dark Matter (1990)
Icefire (1998) (with Judith Reeves-Stevens)
Quick Silver (1999) (with Judith Reeves-Stevens)
Freefall (2005) (with Judith Reeves-Stevens)
The White Island (2009) (with Judith Reeves-Stevens)

Star Trek : The Original Series (with Judith Reeves-Stevens)
42. Memory Prime (1988)
Prime Directive (1990)
The Art of Star Trek (1995)
Star Trek Phase II: The Lost Series (1997)

Alien Nation (with Judith Reeves-Stevens)
1. The Day of Descent (1993)

Star Trek
Federation (1994) (with Judith Reeves-Stevens)
Avenger (1997) (with Judith Reeves-Stevens and William Shatner)
Spectre: Mirror Universe Saga #1 (1998) (with Judith Reeves-Stevens and William Shatner)
Preserver (2000) (with William Shatner)
Captain's Peril (2002) (with Judith Reeves-Stevens and William Shatner)
Captain's Blood (2003) (with Judith Reeves-Stevens and William Shatner)
Worlds in Collision (2003) (with Judith Reeves-Stevens)

Star Trek : Deep Space Nine (with Judith Reeves-Stevens)
The Making of Star Trek - Deep Space Nine (1994)

Star Trek : The Next Generation (with Judith Reeves-Stevens)
The Continuing Mission: A Tenth Anniversary Tribute (1997)

Deep Space Nine : Millennium (with Judith Reeves-Stevens)
1. The Fall of Terok Nor (2000)
2. The War of the Prophets (2000)
3. Inferno (2000)
Millennium (omnibus) (2000)

Star Trek : The Academy (with Judith Reeves-Stevens and William Shatner)
Collision Course (2007)

Going to Mars: The Untold Story of Mars Pathfinder and NASA's Bold New Missions for the 21st Century (1999) (with Brian K Muirhead and Judith Reeves-Stevens)