RIP to a King. Someone who was the (despite the Oscar wins) probably the most underrated New Hollywood director of them all - there were a few misfires but he was producing consistently interesting films into his late 70s.
Exorcist is, arguably, GOAT, or at least up there amongst the very highest tier - just transcendent film-making in terms of the art, in terms of that almost-metaphysical viewer experience it can still provoke (as much as Bergman, pre late-period Malick, Dreyer, Tarkovsky, all those 'serious' film-makers), and also in how it engages, in more complex ways than lots of people allow, with its milieu. Plus just terrifying, even after all the copies and parodies. And TFC, Exorcist and Sorcerer is one of the great 1-2-3 runs of movies, up there with Coppola Godfather-Conversation-GF2 or the major Europeans..