9. James Wan
Simply put, Wan is responsible for the horror franchise to end all horror franchises of the new millennium. He's the writer/director of the original Saw film – 5 more have been released, and yes, a 7th is coming your way this Halloween. Personally, we're not huge fans of these films over here, but you have to give props where props are due. After Scream wrapped up (temporarily – more on that later), after the Halloween movies seemed overwrought (again, more on that later), horror goers were left itching for a new original, totally renewable (at least up to 7 times over) horror series to latch on to. Wan gave them their wish in 2003. Since then, he's only produced the subsequent Saw movies, but has found time to jump slightly away from the horror genre with the 2007 Kevin Bacon thriller Death Sentence. Coming up next – no more writing for Wan apparently, but he'll stay behind the camera for the 2011 slated releases of Insidious (featuring the sorely underrated Patrick Wilson), and the yet to be cast Castlevania. Again, the guy is modern kitsch horror. Props.