Jon Wells is an agent with the FBI.
At least he is for a while. Circumstances will force him to make a career change taking him from the Bureau to Homeland Security but he will still stay inside his area of expertise; the tracking of and apprehension of terrorists out to harm the States. He will quickly add to his list of targets the immense but largely unseen threat of cyber-warfare, especially by the exceptionally gifted hackers from China.
Wells has been a Special Agent with the FBI for just over five years when we meet him in the first recorded adventure. Prior to that he had served for two decades in the U.S. Army, rising to the rank of Lieutenant Colonel, first as a proud member of the prestigious Rangers and then many years working in the Intelligence field chasing down terrorists. While his age is not mentioned, it is likely the late 30s.
Wells enjoys a very pleasant personal lifestyle courtesy of an inheritance gained when "he and his siblings had inherited the mineral rights from the family land holdings" which had been going on for a few years "and the money seemingly never stopped flowing". He does not apparently flaunt his private income but he also does not hide it.
He remained single throughout his military career and beyond but the assignment to Minneapolis, where we meet him, would have the added benefit of reestablishing a relationship with a college romantic interest, Nancy Pillery, Senior VP of Manufacturing at a large corporation based in the Twin Cities, and they would find that the years had matured both and made each a very enjoyable companion for the other.
In the course of the first adventure, Wells will acquire a nemesis in the form of Chinese cyber expert Zhang Xe. Zhang will prove to be an extremely difficult opponent and the conflict between the two will be the driving force for each.