From Halopedia, the Halo wiki
Jon "CJ" Graham, also known as Jon CJG and formerly DigitalPh33r, is a Canadian machinima writer, director, and producer best known for the series, "Master Chief Sucks at Halo" and its sequel series, "Arby 'n' the Chief." His work has been published via YouTube and, after Road to Voi, Machinima.com. Impressed with Jon's machinima projects, Bungie gave him access to Halo 3's at-the-time exclusive Recon Armor Permutation.
Graham was born in Glasgow, Scotland, around 1987. He moved to Vancouver, Canada at age four. Jon did some special effects and filmed a video on YouTube for a few neighbors. He also voice acted in a Halo 2 machinima titled Montage: The Movie.