Who is Paul Hubble from Killing Floor and what is their importance?

Hubble has a normally confident manner with a southern accent. A tall white man, Hubble is in his early thirties and in trim condition. He has sandy colored hair that is beginning to recede, and a square jaw. He wears gold-rimmed round eyeglasses and when he smiles, his teeth are white and straight. Comfortable in polo shirts and chino pants, he wore boat shoes and draped a thick white sweater over his back the first time Jack Reacher saw him in the Margrave Police Department.