Who is Nate from The Testament and what is their importance?

Nate O'Riley was a forty-eight year old attorney employed by the Stafford Law Firm. He was an excellent litigator but at the time of the story, he was taking a leave of absence from work. He was divorced twice and had four children named Daniel, Kaitlin, Austin, and Angela. Nate was an alcoholic as well as being an occasional drug user. His alcoholism resulted in his two divorces. Nate had a history of devoting himself to work at a vicious pace and then burning out.