- Author: Ryder Syvertsen Author Record # 1450
- Legal Name: Syvertsen, Reidar Otto
- Birthplace: USA
- Birthdate: 19 April 1941
- Deathdate: 24 February 2015
- Language: English
- Webpages: SFE
- Used These Alternate Names: John Sievert, Ryder Stacy
- Author Tags: horror (2), psychic ability (1)
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Novels
- America's Last Declaration (1985)
- America's Last Declaration (1985) with Ryder Stacy
- America's Sword (1990)
- America's Sword (1990) with Ryder Stacy
- America's Zero Hour (1986)
- America's Zero Hour (1986) with Ryder Stacy
- American Death Orbit (1988)
- American Death Orbit (1988) with Ryder Stacy
- American Defiance (1986)
- American Defiance (1986) with Ryder Stacy
- American Dream Machine (1990)
- American Dream Machine (1990) with Ryder Stacy
- American Eden (1987)
- American Eden (1987) with Ryder Stacy
- American Glory (1986)
- American Glory (1986) with Ryder Stacy
- American Nightmare (1987)
- American Nightmare (1987) with Ryder Stacy
- American Overthrow (1989)
- American Overthrow (1989) with Ryder Stacy
- American Paradise (1988)
- American Paradise (1988) with Ryder Stacy
- American Rebellion (1985)
- American Rebellion (1985) with Ryder Stacy
- American Ultimatum (1989)
- American Ultimatum (1989) with Ryder Stacy
- Bloody America (1985) with Jan Stacy
- Bloody America (1985) with Ryder Stacy
- C.A.D.S. (1985) with Jan Stacy
- C.A.D.S. (1985) with John Sievert
- Cave of the Master (1990)
- Cybertech Killing Zone (1989)
- Cybertech Killing Zone (1989) with John Sievert
- Darkness Descends (1988)
- Death, American Style (1987)
- Death, American Style (1987) with Ryder Stacy
- Doom Commander (1989)
- Doom Commander (1989) with John Sievert
- Doomsday Warrior (1984) with Jan Stacy
- Doomsday Warrior (1984) with Ryder Stacy
- Fortress of Forbidden Destiny (1991)
- Mystic Rebel (1988)
- Psychic Spawn (1987) with Rosemary Ellen Guiley
- Psychic Spawn (1987) with Adrian Fletcher
- Red America (1984) with Jan Stacy
- Red America (1984) with Ryder Stacy
- Tech Battleground (1986)
- Tech Battleground (1986) with John Sievert
- Tech Commando (1986)
- Tech Commando (1986) with John Sievert
- Tech Inferno (1988)
- Tech Inferno (1988) with John Sievert
- Tech Satan (1988)
- Tech Satan (1988) with John Sievert
- Tech Strike Force (1987)
- Tech Strike Force (1987) with John Sievert
- Temple of Dark Destiny (1989)
- The Dancing Dead (1988)
- The Last American (1984) with Jan Stacy
- The Last American (1984) with Ryder Stacy
- The Great Book of Movie Monsters (1983) with Jan Stacy