He will be portayed by Karl Geary in the film adaptation.
Dr. Neblin has been treating John for his anti-social conduct. He is the first person John told about his Rules to keep him from becoming a serial killer. Dr. Neblin gave John a grounding in the normal non-sociopathic world and helped John figure out Mr. Crowley's motivation for staying in his current identity.
- His first name is Grant in the film