It was either the head linesman or the line judge; the play didn't get far enough off the line of scrimmage for me to notice whether he was covering the backfield or defensive side after the snap. I don't have any idea how long he's been in the league, his favorite hobbies, his home town or whether he uses clippers or scissors on his toenails.
I'd say his odds of keeping his NFL job after this season are about 10:1 at best.