6. Clive Barker
For Preston, Clive Barker is responsible for many a nightmare of his from around 6 years old to 10 years old – even without having seen one of his films (the movie boxes at the local Blockbuster were enough.) He's the man behind the Pinhead, Hellraiser's iconic, horrific, nasty hitman from Hell. Transitioning from horror novelist to filmmaker, Barker has created some of the most memorable horror films of the past 20 years, including the Hellraiser films, the Candyman series, and the Scott Bakula nightmare Lord of Illusions. He hasn't stepped behind the camera so often, but he's slated to get back in action on the upcoming Tortured Souls: Animae Damnatae. There's really not much else to say – the guy's name is synonymous with the horror genre, even if you've never seen any of his movies.