Jameson owned a salvaging company called Jameson Marine Incorporated. He directs Nathan to a sunken train car which they salvage and find copper inside. After losing a salvage operation to another company, he urges Nathan to take on a salvage operation in Malaysia. Nathan doesn't take it at first because Jameson does not have the permits, although Jameson left the opportunity up to Nate's decision if he chooses to undertake it.
He later appears in the ending cutscene of the final chapter, proclaiming that he is selling Jameson Marine Incorporated to Nathan and Elena.
He is friendly to Nate and they know each others' wives.