At the beginning of the game, Jeffreys appears to have gone missing and Sam Goodall communicates with Robin by asking her to find Jeffreys.
Nothing is known of Jeffrey's past before Below Zero, though he was hired before Robin, and strangely disappeared before the start of the game.
Events of Below Zero
He is mentioned briefly by Sam Goodall, who asks Robin to find him.
Spoiler alert: The following section contains story related material.
Jeffreys is later found 50 kilometres away from Sector Zero, claiming a Warper transported him there. It is likely this is a lie, as Jeffreys' log found in Research Base Cappa suggests that he was aware of Al-An's existence and had accessed Sanctuary Zero before, going onto say that he was heading South to further investigate, operating outside of the knowledge of Vesper Station.
Jo and Robin seem to be good friends, as Robin was concerned for his well being when he disappeared.
While they do not interact much within the game, Sam does appear to care somewhat for him, evidenced when he was found by Robin and Al-An.
"SAM: Robin, they found Jeffreys, they're returning him to the Vesper now.
Operation week 12, 4546B.
Operation schedule delayed but not compromised by external factors.
Gained access to sanctuary, but unknown third party has already removed the target.
Vesper is not yet aware. Whoever is in possession is acting for themselves.
Heading south out of zero sector to continue investigations.
|Source: PDA in Research Base Cappa|