O. Olivette

 was the first Overseer of Vault 81 and the person responsible for destroying its experiment - and saving the inhabitants.

Background
In practice, the experiment was derailed the moment Vault-Tec accepted the candidacy of Dr Olivette as Overseer. With a moral backbone and a strong sense of right and wrong, Olivette was aware that the program may include human trials and swore that should they breach ethics, he'd blow the whistle. He participated in drills just like everybody else, shocked to realize that half the science teams were medical students, cramming for finals. The pay certainly kept them happy and ensured compliance in the experiment, should it take place. But the perspective of being rich did not obscure the reality of the experiment to Olivette. When presented with the program of clinical trials as part of his Overseer briefing, he realized that he can't blow the whistle - Vault-Tec was embedded in the military-industrial complex too deep. Coupled with the good people slated for inclusion in Vault 81, he felt trapped.

Olivette did what they could to destroy the experiment: They cleared the phone list for the science staff, ensuring that none of them would be notified about future drills. When the October 23, 2077 drill began, the beta alert was soon upgraded to alpha and the Great War came. Due to the Overseer's sabotage, none of the science staff received a notification about the drill. Despite his efforts, three researchers showed up: Kenneth Collins and Jim Flint reached the Vault from the Fens with the general population, while the overachiever M. Burrow was already on site. They reported to the research area and were sealed inside. This meant that the danger to the residential population still existed.

Although there were only three of them, ensuring that the generations-long research plan would die out, they had state of the art equipment, centuries' worth of supplies, and the Contagions Vulnerability Robotic Infirmary Engineer, meaning that with even their limited manpower, they could still be a threat until they died.

To compensate for their limited manpower, Collins upgraded and modified Curie, from a customized Mr Handy, into a fully fledged lab assistant. He provided her with a custom personality, loading the databanks with every great body of work he had to make her more life-like, more... Human. And so, CVRIE became Curie. With her help, the work picked up the pace and quite soon, the Phase I trials began. When notified of it, Olivette was mortified and played for time, while maintaining an aura of camaraderie, taking care to not reveal his intentions. While the mood among the three researchers remained stable thanks to Collins and Curie, they still had access to the nozzles and could release the pathogens for a Stage III trial - or worse. When a minor mishap with the mole rat population was resolved and stage II was progressing rapidly, Olivette made the decision.

The Overseer sabotaged the delivery nozzles inside every residential quarter and room on his side of the Vault. Then, when the researchers began to notice, they disconnected the only terminal that could communicate with the science team and dumped it in the reactor chamber, near the sealed backup entrance into the science section. Sealed in the research wing, the scientists grimly continued their work, never to see the light of day again.

Appearances
is mentioned only in Fallout 4.