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The Black Mesa Anomalous Materials team posing in Black Mesa's Anomalous Materials lobby before the Black Mesa Incident. It includes, from left to right: an unknown scientist featured in a Borealis picture from Mossman's message, Eli Vance (Scientist 03, a.k.a. "Luther"), an unknown female scientist also featured in a Borealis picture from Mossman's message, an unknown scientist (Scientist02, a.k.a. "Einstein"), most likely Wallace Breen, an unknown scientist, Isaac Kleiner (Scientist 01, a.k.a. "Walter"), Gordon Freeman, and an unknown scientist (Scientist 04, a.k.a. "Slick"). Picture owned by Kleiner in Half-Life 2. "A.M.G." likely refers to "Anomalous Materials Group", although this term is never used in any game.

Half-Life 2

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  Early version.