Born in Boston, MA to an Irish family.
His birth is hidden from his future Keeper by friendly Changelings.
Only about 1 week was experienced by Jack in Arcadia. He is rescued by a Changeling, but is not aware of what has happened to him. Upon returning Jack kills his fetch mostly by accident. Jack believes himself to be having a nervous breakdown.
While he was away, Jack's fetch had setup to betray government secrets. There is not enough evidence for charges to be brought against Jack, but he is fired and forever labeled as a security risk.