As reported earlier, Brian Gewirtz was removed from his position as the Senior Vice President of Creative Writing but remains employed. He will be replaced by Eric Pankowski, who was hired in February, and previously worked as a senior executive at Reveille and Warner Bros.
The head writer for Raw is David Kapoor who also goes by Ranjin Singh. The head writer for Smackdown is Ed Koskey however, Koskey is going to be taken off the road and will be working more out of WWE Headquarters. Gewirtz was working above both and anything they wrote had to be approved by him before going to Stephanie McMahon. Vince McMahon of course approves everything as he has the final say.
Source: PWInsider.com