JoBeth Williams, precisely 5ft 5 ½ (166.4 cm) tall, embodied a petite yet commanding screen presence that defined her career. Her exact height lent authenticity to relatable roles like the everyday mother in Poltergeist (1982) and its sequel Poltergeist II: The Other Side (1986), where her stature amplified the vulnerability against towering supernatural threats. In ensemble dramas such as The Big Chill (1983) and comedies like Stir Crazy (1980), her 166.4 cm frame enhanced her approachable, grounded image. Highlights include Teachers (1984), The Day After (1983), and transitioning to television directing.