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Here’s Bryan Cogman, executive story editor and writer. Besides writing two episodes of the series to date (and a third waiting to be seen with the new season), his role is to help maintain the continuity of the series and to help bring in what they can from the novels into the show. We’ve interviewed him previously, for the first season and the second.
He was also very much kind enough to take me (along with GRRM and Parris) around the set back when the production was in its first season, which led to a lengthy set visit.