From Halopedia, the Halo wiki
Frances Walsh, MNZM, (born January 10, 1959), is a Grammy and Academy Award-winning screenwriter, film producer and musician. She has been the partner of filmmaker Peter Jackson since 1987.
Walsh has contributed to all of Jackson's films since they met while filming Bad Taste.
Walsh and Jackson were signed on to be executive producers of the Halo film, before the project fell through and was put on indefinite hiatus. She was expected to collaborate on the script for the film.