|Full Name||Stephen Kellerman|
|Occupation||Arkham Asylum Psychiatrist (formerly), Arkham City Medical Personnel|
|Base of Operations||Arkham Asylum/Arkham City|
|Voice Actor||Keith Ferguson|
|First Appearance||Batman: Arkham Asylum (Summer 2009)|
Before Arkham Asylum Incident
When Quincy Sharp reopened Arkham Asylum, he hired Stephen Kellerman as psychiatrist. Dr. Kellerman treated many inmates at the asylum, Scarecrow and Poison Ivy being the most notable ones.
During his sessions with Poison Ivy, Dr. Kellerman was, unbeknownst to him, slowly being hypnotized by her phermones. At one point Kellerman disappeared, which caused Warden Sharp to question Poison Ivy as the security cameras showed her hypnotizing him. Thankfully, he was found through unknown means.
During another incident, Scarecrow somehow managed to spread his Fear Toxin all through the Asylum. He did so during an interview with Kellerman who seemed to be infected. Unknown to Scarecrow, however, Kellerman and Batman had been working together on a cure, and Kellerman had managed to fool Scarecrow. Batman then had Aaron Cash flood the Asylum with an antidote while he dealt with Scarecrow.
Arkham Asylum Incident
Dr. Kellerman was one of the doctors who was kidnapped by the Joker's Henchmen. He, along with Aaron Cash, were trapped in the Patient Observation Room, which was full of Smilex, until Batman appeared and rescued them. When meeting with the other rescued doctors and Batman in the Sanatorium, Dr. Young insisted on going to the Arkham Mansion to retrieve her notes. Cash agreed to escort her to the Mansion and, after that, to a safe hiding place. They left. Batman noticed more henchmen coming up the elevator. He advised the remaining doctors (Dr. Cassidy and Kellerman), to go back to the Patient Observation Room and hide there. They remained there for the rest of the game, and conversed in low voices about the events that happened around the island.
After Arkham Asylum Incident
It was shown that the doctors in the Patient Observation Room survived Joker's takeover (this included Dr. Kellerman). It was assumed that he returned to his usual duties at the asylum until it was closed down by Mayor Sharp.
- "Did you find the commissioner?"
- "Just after you took the elevator down, the PA was full of screaming. It was horrible."
- "I suppose the mysterious Patient X was kept down on the lower floors."
- "What's happening? The whole building started shaking."
- "How much more can these old buildings take before they collapse?"
- "Fireworks? What's there to celebrate?"
- Dr. Kellerman was known to have treated two of Gotham City's most dangerous criminals: Poison Ivy and Scarecrow.