|The following is based on Fallout: Brotherhood of Steel and is not canon.|
Dubois is the chief scientist of the Secret Vault.
A French man who believes that the research that was done in the vault is of high priority. It is probably him who came into conflict with Blake, which led to a major explosion and started the chaos in the vault.
Interactions with the player character
The Initiate is looking for him in order to get access to the vault laboratories, but when he is found and talked to for a minute, Dubois is eaten by a mother deathclaw, native to this vault. The "mama deathclaw" was killed and the keycard was recovered from her stomach.
Dubois appears only in Fallout: Brotherhood of Steel.