Series

Songs of Earth and Power
1. The Infinity Concerto (1984)
2. The Serpent Mage (1986)
Combined and Revised as: Songs of Earth and Power (1992)

Eon
1. Legacy (1995) (prequel)
2. Eon (1985)
3. Eternity (1988)

Forge of God
1. The Forge of God (1987)
2. Anvil of Stars (1992)

Darwin
1. Darwin's Radio (1999)
2. Darwin's Children (2003)

Quantico
1. Quantico (2005)
2. Mariposa (2009)

Halo
1. Halo: Cryptum (2011)
2. Halo: Primordium (2012)

The Foreworld Saga
1. The Mongoliad: Book One
2. The Mongoliad: Book Two
3. The Mongoliad: Book Three