Eliza/DoctorWeizenbaum devised a startling invention in the mid-1960s: the first computer character. When Eliza system that he built ran his script, Doctor, it could simulate a Rogerian psychotherapist in a way that was, if nothing else, highly amusing and enjoyable. Eliza/Doctor is the first “chatterbot,” and has remained available through the decades, since Weizenbaum documented the system well enough for it to be re-implemented.