The leader of the Silencerz and also a US Armed Force Major. He drives the Iridium, Magnesium and Anthracite. He is also Vert's father. He and Vert don't seem to have a very close relationship because Jack wanted to ground Vert for a month, despite his apparent acknowledgement of Vert after winning Highway 35. When Vert ended up in the Silencerz headquarters at the end of the final movie, he encountered his father who told Vert that they need to talk. In "Breaking Point." Jack told Vert that he should be more careful or quit racing with the Teku.