Jonathon Price is a freelance agent.
That is not really true since the notion of freelance is the ability to pick and choose who the individual might work for and Price really does not work for anyone other than himself. However, it does fit in that he gets involved in things that interest him or which are important to him so he is the one doing the deciding.
When we first encounter him, he has been for the past two years happily a civilian living a very good life since he was quite wealthy from an inheritance (probably from his parents). Prior to that, though, he had served honorably and with considerable distinction in the U.S. Navy SEALs. He has no regret over the years he put his life on the line serving his country and he looks back on it all with understandable pride.
Those years had, though, put a toll on him and he had decided that it was important to start a new chapter without all the fighting and danger and watching friends pay the ultimate sacrifice. Unfortunately for Price, his grandfather William had, just prior to his death from cancer, put together a plan to combat a terrorist plan of horrific potential that the elderly man had learned of. Heading up the team that his grandfather had put together for this mission was to be Price.
It was a very strange farewell by the old man, saying his goodbyes in a recorded message while telling the younger man that his recently acquired peaceful life was about to vanish, likely forever.
The elder Price knew that the younger man would not - could not - ignore the threat that the old man had uncovered and so Jonathon Price would again put his life on the life, again and again.