Outside of Rooster Teeth, he is known for voicing characters from other anime and video games.
Gray's wife, Lara Toner, is also an actress, and has a cameo in gen:LOCK.
On June 20, 2019 Haddock stepped down as the Head of Animation, being given a purely creative role in the division instead, after several former RT animators had complained on Glassdoor. Their complaints revolved around general mismanagement, Crunching, (the act of forcing employees to work overtime right before a release), and over reliance on contract workers who would be promised permanent work but then let go. Matt Hullum addressed these complaints in an apology acknowledging them and stated that the Animation department had been going through an internal review and Haddock being removed from head animator was not influenced by the controversy.
On September 13, 2019, in response to various Rooster Teeth layoffs, Haddock announced that he had recently parted from the company. However, he claims he was already transitioning out, and his work as an independent contractor would probably lead to more gigs with RT.