Stefan Wul was the nom de plume of French science fiction writer Pierre Pairault. He was a dental surgeon, but science fiction was his real passion. Most of his books reflect that, showing a deep knowledge of scientific data. Pairault retired from dental surgery in 1989, but remained active in the French science fiction scene.

He published eleven novels between 1956 and 1959 and a twelfth in 1977. Only one, Le Temple du Passé (1957), was translated into English, as The Temple of the Past in 1973. His fame outside of French-speaking countries is instead due the animated adaptations of two of his novels by René Laloux.
His work also include short stories and poems of science fiction.