Arnold Gordon was a Character on DEXTER.
He is a patient of Dr. Evelyn Vogel, who was a trauma surgeon. He resented Dr. Vogel for constantly calling him a psychopath and threatened to hurt her if she ever told anyone that he was. After Dexter finds out that Ron Galuzzo is a cannibal that eats brains, he realizes that he is clearly not The Brain Surgeon and Vogel suggests that he look into Gordon. This clearly proves to be a dead end, since Gordon is never mentioned again.