Fox collaborated on the first LISP interpreter for the PDP-1.
On March 1, 1961, Phyllis Fox started her work on the early LISP interpreter for the PDP-1 system. This marked her entry into a pioneering group of computer scientists focused on artificial intelligence. Her contribution helped lay the groundwork for LISP's foundational role in AI and advanced programming. By documenting the early interpreter, Fox facilitated further development in computational theory and AI programming.