G. C. Edmondson, the primary pen name of José Mario Garry Ordoñez Edmondson y Cotton, was an American writer active during the mid-to-late twentieth century. Born in Washington state in 1922, Edmondson served as a United States Marine during the Second World War. Possessing a remarkable facility for languages, he was fluent in six tongues, which allowed him to work professionally as a translator in addition to pursuing his career in fiction.
Edmondson's career as a science fiction writer officially commenced in 1955 with the publication of a short story in the influential magazine Astounding. Over the subsequent decades, he produced a body of novel-length work that became noted for its imaginative engagement with time travel and its frequent incorporation of Latin American settings and cultural themes. Beyond science fiction, Edmondson was a versatile genre writer who authored numerous Westerns under various pseudonyms, including Kelly P. Gast, J. B. Masterson, and Jack Logan.
Despite his contributions to speculative fiction and his distinct thematic focus, Edmondson did not achieve widespread mainstream fame. Several prominent figures in the science fiction community, including author and editor Gardner Dozois, have characterized him as a neglected writer whose work deserves greater recognition. Edmondson spent his later years in California, where he passed away in San Diego in 1995.
