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