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I don't get the Vaults. When it's time to come out, what if people are still alive on the surface? They'll be Stone Age creatures, probably eat whoever steps out of your Vaults.

Leon Von Felden was a pre-War scientist. As a representative of West Tek, he served as the research head of the Forced Evolutionary Virus Project at the West Tek Research Facility and later the Mariposa Military Base, where he possessed the highest corporate security clearance.[1]


Sometime before 2077, Von Feldon attended a meeting that included Vault-Tec Corporation executives Barb Howard and Bud Askins, as well as executives from other corporations: REPCONN Aerospace's Julia Masters, RobCo Industries's Robert House, and Big MT's Frederick Sinclair. While he was skeptical of the Vaults' creation, Von Feldon posited a scenario for a Vault involving developing a super-mutant soldier using illegal immigrants when given the chance.[2]

Later in October of 2077, when the Mariposa Rebellion took place, Von Felden was one of the last scientists to be interrogated after the military discovered the experiments with FEV going on there. He was being interrogated on October 23 when halfway through, Mariposa lost contact with the outside world.[3] Without any expectation of bringing the scientist to justice for his crimes, Captain Roger Maxson ordered Von Felden's execution as well, though, at the very least, he also arranged for all the scientists to receive a proper burial, if only to ease his own conscience.[4]


Leon Von Felden is mentioned in Fallout and in Fallout 3. He appears in the Fallout TV series episode "The Beginning."


  1. West Tek records
  2. Fallout (TV series) Episode 8: "The Beginning"
  3. Captain Maxson's diary: "Oct. 23 2077
    I can't believe those bastards finally did it. Damn them all to Hell. They finally let the A-Bombs fly. We were right in the middle of trying to pry the real story out of von Felden when we completely lost contact. I have a feeling the research center was hit hard. I don't know why, just call it a gut feeling. It seems inconceivable that we were not targeted. I'm sure China will make up for that oversight real soon. Luckily, we had moved our families from outside into the facility the day before yesterday. We do not yet know if the fallout has reached this area."
  4. Captain Maxson's diary: "Oct. 26 2077
    I convinced the men that we should bury the scientists. I don't know why...perhaps it was to ease my conscience. I finally started to believe their stories when the last one was dying.

    My God, what have I become?"
Fallout TV series characters