|Position||-CEO of Hammer Industries|
When Hammer learned that Stark was in disgrace after a drunken binge at his own birthday party and that James Rhodes had procured the Iron Man Mark II for the military, he offered up various weapons to augment the latter's armor. However, Hammer eventually discovered that Vanko was secretly siphoning company resources for his own armor. Hammer was so angry that he placed Vanko under house arrest. But Vanko freed himself, hanged his guards, and took control of the drones and the new War Machine armor when Hammer was unveiling them at the Expo, ordering them to target Stark. As he tried to regain control of the situation, Hammer was confronted by Pepper Potts and Natasha Romanoff, who demanded to know where Vanko was. When Hammer tried brushing them off, the latter grabbed him and forced him to reveal Vanko's whereabouts. Potts then called the police to have Hammer arrested. As he was being led away Hammer promised, "This isn't over." He was taken into S.H.I.E.L.D. custody.
After SHIELD fell, HYDRA saw Hammer as a opportunity to be one of their highly ranked business figureheads. With SHIELD's reputation as a terrorist organization revealed HYDRA was able to get Justin out on parole. He was later approached by Dell Rusk who informed him about the circumstances of his release and promised him a return to glory if he cooperated. Hammer Industries was later placed under both his and his sister Justine's control ,and together they joined forces with AIM.
Implied strong software and mechanical knowledge but unclear in film whether he is actually much of a designer or simply takes credit for his company's products.