Television News 'Game of Thrones' producer Bryan Cogman to write fifth prequel series 09/21/2017 Game of Thrones co-executive producer Bryan Cogman has a fifth prequel series in the works. Read More RELATED NEWS Jimmy Fallon's 'The Tonight Show' dropping to only four nights a weekAshley Tisdale announces birth of her second childSelena Gomez is a billionaire TAGS: David Benioff Bryan Cogman D.B. Weiss Game of Thrones
