The show only lasted nine episodes, but the same day it was cancelled, HBO officially picked up Game of Thrones with David Benioff as co-showrunner.

Benioff hired Cogman as his personal assistant, copy-editing scripts in the first season, but then abruptly promoted him to be the official writer for the fourth episode.

[3] In 2014, Cogman was hired by 20th Century Fox to write a feature film based on characters and stories from Magic: The Gathering,[5] a popular fantasy trading card game.

[9] In May 2019, George R. R. Martin mentioned on his blog that Cogman would be helping Amazon Video with their new The Lord of the Rings series.

[11] In March 2023, Cogman was announced as the series showrunner for the Disney+ television adaptation of Zorro with Wilmer Valderrama set to star.