John Viera is an agent with the Network.
That term refers to a "nameless, unorganized group of former intelligence operatives and their connections who served for nothing more than duty, honor, and country - the people the official Intelligence Community turned to when it needed something strictly off the books."
Officially, this former operative with the CIA is now a civilian working as a security consultant hired by companies around the country to find holes in their security which would allow thieves, from outside as well as inside, from robbing these firms of thousands if not millions of dollars of merchandise and technology. He appears to be very good at his 'day job' although as one pompous middle manager at a company found, he is not a team player.
At least not unless the team is part of this Network. Then he is very much dedicated to the mission, even if it takes him, as it often does, away from his home.
In that home, he is married for seven years to Kelly, a veterinarian who is very much pregnant, ready to give birth to their first child. Her mother, not a fan of Viera in the least, refers to him derogatorily as 'the Spaniard'. The hurt this woman causes to Viera will be worse than what the official bad guys do to him. And all of it comes after Viera had given up his career with the Agency to be more of a at-home husband. Unfortunately, both his official job and his unofficial Network assignments do take him away for long bouts and that just adds fuel to the woman's vitriol.
In the adventures we have of his, Viera works closely with an MI6 agent named Martin Blackburn. They have had each other's backs for quite a while by the time we meet them and have relied on each other for survival and success many times.