Keir Dullea, precisely 5ft 10 (177.8 cm) tall, embodied a commanding yet approachable stature that defined his cinematic presence. His exact height lent an authoritative poise to astronaut Dave Bowman in 2001: A Space Odyssey, making him the ideal everyman explorer amid cosmic vastness. This physical ideal also enhanced his intense performances in David and Lisa and Black Christmas, where his height amplified emotional depth and screen dominance in psychological thrillers.