J. U. (John Ulrich) Giesy

Born in Ohio in 1877, John Ulrich Giesy was an American physician who built a parallel career as a novelist and pulp-magazine writer. He became especially associated with early sword-and-planet adventure through his Jason Croft stories, and he also wrote under names including J. U. Giesy.

His fiction appeared in popular magazines in the 1910s through the 1930s, and reference sources also note collaborations with Junius B. Smith. Beyond science fiction, his work ranged into mystery, western, occult-flavored adventure, and silent-era screenwriting, which helps explain the wide mix of titles still linked to his name.

Readers who find him today usually come through classics such as Palos of the Dog Star Pack, The Mouthpiece of Zitu, and Jason, Son of Jason. He died in Salt Lake City, Utah, in 1947, leaving behind a body of imaginative popular fiction that still appeals to fans of early pulp adventure.