G. C. Edmondson was an American author best known for his contributions to science fiction and Western literature. Born in 1922, he served in the U.S. Marine Corps during World War II and later became a prolific writer under various pseudonyms, including Kelly P. Gast for his Westerns.

His most acclaimed work is The Ship That Sailed the Time Stream (1965), a time-travel adventure involving a U.S. naval vessel, which earned a Nebula Award nomination. Edmondson’s writing often explored themes of time travel, Latin American culture, and Native American perspectives, blending speculative fiction with cultural depth.

He also collaborated with C. M. Kotlan on a trilogy involving genetic evolution and artificial intelligence, and was known for his quirky, satirical style. Despite his talent, he’s considered by some critics to be a neglected figure in science fiction.