You will notice it towards the bottom of the page as In Development.  The only thing that isnt noted there is the actual credits, though I did play a major part in writing Ratred, and it was my idea and concept, Ratred: The Following was a very collaborative screenplay.  In all actuality it was written by Frank G. Lawrence, and the story was by David Coupe, Myself and Mike Wills created the concept, and I oversaw both the story treatment and screenplay.  When Nehst called for rewrites, it became even more collaborative as my partners Jeff Kalvin and Mikel Schardt played a fundamental role in researching real cults and bringing reality into the story. 

http://www.nehst.com/_media/_pdf/2008SlatePressRelease.pdf