Stephen Allen Robinett (13 July 1941 – 16 February 2004) was an American writer of science fiction and mystery novels and short stories. Robinett's first publication appeared in the March 1969 edition of the magazine Analog Science Fiction and Fact: the novelette "Minitalent", which was published with his most-used pseudonym, Tak Hallus (derived from the Persian takhallus). By the mid-1970s, however, he had begun using his own name. He published two novels, Stargate and The Man Responsible during the mid-1970s, and continued to publish novels and short fiction until the early 1990s.