William Brent Bell is an American filmmaker. He is best known for directing horror films such as "Stay Alive" (2006), "The Devil Inside" (2012), "Wer" (2013), "The Boy" (2016), "Brahms: The Boy II" (2020), "Separation" (2021), "Orphan: First Kill" (2022), "Lord of Misrule" (2023), and "Orphans" (2027). He is the founder of production company The Machine Room.