The capacity for time travel has made human history a fragile thing. To protect the continuity of that history and guard humanity's mysterious destiny, the men and women of our own future have established the Time Patrol, a far-flung organization dedicated to preserving the timelines and foiling the attempts of those who would change history to suit their own purposes.
- Time Patrol (1955)
- Brave to be a King (1959)
- Gibraltar Falls (1975)
- The Only Game in Town (1960)
- Delenda Est (1955)
- Ivory, and Apes, and Peacocks (1983)
- The Sorrow of Odin the Goth (1983)
- Star of the Sea (1991)
- The Year of the Ransom (1988, novel)
Poul Anderson (1926–2001) was born in Pennsylvania of Scandinavian stock. He started publishing science fiction in 1947 and became one the great figures in the genre, serving as President of the Science Fiction Writers of America, winning many Hugo and Nebula awards, and also winning the Gandalf (Grand Master) Award.