John Nathan is a forensics expert who works with Kiefer from time to time, often managing to find information and get Kiefer access into hard places. He feels like he is a strategist, believing that what he does is paving the way to something bigger, for Kiefer, himself and everyone he comes across.

When not working with Kiefer, he creates explosives and sets them across towns and cities, causing chaos, unknown to Kiefer or anyone that have come across him.

John Nathan is a man who has lost everything, and has used this to his advantage to create a new identity (Johnathan) and not be caught. Due to his immense success of creating a new path, he becomes a tad narcissistic, thinking he is the best and no one could ever do better than him, at times he proves this right.

Apart from forensics and bomb-making, John Nathan creates AI, however they appear to be somewhat flawed, whether they become rampant instantly or corrupt people and systems.