James Kingston is known as a "professional adventurer." He does various parkour and daredevil-like things. Some of his work includes jumping from rooftop to rooftop, and hanging from a crane with one hand.
He teamed up with Kim to create a video for the game, Thief, being Kim's "stunt-double." He was dressed up as Garret from Thief and was performing various stunts, as he was supposed to be Kim dressed up like Garret.