Variety reports that Gemma Jackson, an award-winning production designer, is returning to resume those duties on HBO’s Game of Thrones after having done so for the pilot. It seems that her contract with the production did not, strictly speaking, lock the production or Jackson to signing on for the series but now it’s moot, as she’s signed on.
Her previous credits include HBO’s magesterial John Adams (for which she won an Emmy). She appears in is “Making Of” video at the 1:40 mark, discussing the gigantic set and how it was reused to represent several different cities:
(Watch past that mark to see Gemma Jackson later on, when the sets and locations are discussed, and to see Robert Stromberg—visual effect supervisor for Game of Thrones—showing some of what can be done with digital mattes.)