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I can only remember two times when the G-Man appears with another character (though correct me if I'm wrong). Both are at the start of the game.
During the initial tram-ride he is sharing a car with another scientist, and then again once you pass the reception area he can be seen (and heard unclearly) speaking to another, different scientist in a sealed room.
Can anyone tell me if either of these appear again? Do we know if they are generic? Could the one in the tram be Kleiner or Walter?
I have a feeling the lab-coated man he speaks with at length is the administrator. Does anyone else have any relevant information/ideas?