Offutt began publishing in 1954 with the story "And Gone Tomorrow" in the
If. Despite this early sale, he did not consider his professional life to have begun until he sold the story "Blacksword" to
Galaxy in 1959. His first true science fiction novel was
Evil Is Live Spelled Backwards in 1970. Offutt disliked the title of this book, calling it "embarrassingly amateur". Offutt wrote numerous novels and short stories, including several in the "
Thieves World" series edited by
Robert Asprin and
Lynn Abbey, which feature his best known character, the thief, Hanse, also known as
Shadowspawn (and, later, Chance). His "Iron Lords" series, likewise, was popular. Offutt also wrote two series of books based on characters by
Robert E. Howard. There was a series on Howard's best known character,
Conan, and another one on the less known
Cormac mac Art—an Irish Viking active in
King Arthur's time. In fact, Offutt wrote about him far more extensively than did Howard himself. As "John Cleve", Offutt also wrote the 19-book
erotic science fiction series "Spaceways", over half of which were collaborations. As an editor Offutt produced a series of five anthologies entitled
Swords Against Darkness, which included the first professional sale by
Charles de Lint. From 1976 to 1978 he served as president of the
Science Fiction Writers of America (SFWA). ==Career in erotica==