He is best known for his work on Rooster Teeth's famous Machinima series Red vs. Blue, for which he wrote the story; he also provided voice work for the character Church among several others. He remains intimately involved in many Rooster Teeth productions, hosting the internet game show The Gauntlet and the reality series Immersion, as well as starring in the feature film Lazer Team. He also regularly appears on the Rooster Teeth Podcast.
He is currently engaged to Rooster Teeth employee Ashley Jenkins, who voices Coco Adel in RWBY. The couple appeared together on Season 28 of the CBS reality television show The Amazing Race, which was nominated for an Emmy Award.
- Burnie appeared, animated in the style of a RTAA, in the Animated RT Recap, alongside an RTAA version of Joel Heyman, Gus Sorola and various characters from Red vs. Blue and RWBY.