Overseer

An Overseer was the leader of a Vault-Tec Vault and according to Fallout 3 Survival Guide - Vault-Tec official. The Overseers were often aware of the Vaults being an experiment and helped coordinate it.

See:
 * Vault 8 Overseer
 * Vault 13 Overseer
 * Vault 92 Overseer
 * Vault 101 Overseer
 * Stanislaus Braun, the Vault 112 Overseer