Jay Caselberg is an Australian science fiction/mystery author. As of September 2007, he has published four novels and multiple short stories under his own name. He has also written under the pseudonym James A. Hartley. All of the books published under his own name feature "psychic investigator" Jack Stein, a man whose slight psychic talent (which manifests in dreams and gut feelings) led him from a job in the military to a stint in Intelligence, and later to a job as a private investigator.