Dr. Judith Mossman is a scientist who plays an integral role in the Golmar Earth Uprising. She is a cunning and manipulative triple agent, aiding both sides during the Uprising but eventually siding with the Earth Freedom Fighters. Later on she discovered a secret and powerful project that could be used against the Axis. Mossman has a friendly if cunning personality, tempered by a certain amount of arrogance. She does not get on well with Alyx Vance, due to what Mossman considers is Alyx's blasé attitude towards the Resistance's scientific equipment, and also possibly due to Mossman's attraction to Alyx's father, Eli.