Director Langston Graham was the direct superior of agent Sarah Walker, and assigned her to follow up on Bryce's theft of the Intersect by sending her to Burbank to track down where he sent the data.

Graham is one of a few people who knew Sarah's real name (from her birth certificate), as well as the series of aliases she used growing up as part of her father's con jobs.

Graham served as the CIA liaison to General Beckman and the US Department of Defense,[2] and in several episodes assisted her in briefing the team on their upcoming missions and providing additional intelligence.

It wasn't until that episode where it was revealed that Graham was fully aware of the termination order, and was unsympathetic to Casey's objections that Chuck's skills made him a promising analyst.

Actor Tony Todd has reprised his role twice more in the series, appearing in a flashback at the end of "Chuck Versus the Cougars", where it is revealed that Graham mentored Sarah Walker after arresting her father to protect him from a scam gone wrong.

He mentored Sarah in the CIA, and placed a significant amount of trust in her by allowing her to proceed with her operation to find the Intersect despite Casey being sent in by the NSA to clean things up.