He is one of the main characters of the Hlaf-Life series. He is a former Black Mesa scientist and one of the few survivors of the Resonance Cascade. He is kind, good-humoured and charismatic. He has a daughter named Alyx. He works with the Resistance, Issac Kleiner and Barney Calhoun to fight against the Combine. He's 60. He has an IQ of 145. He has short grey hair, brown eyes and a beard. He wears a green sleeveless jacket over a Havard sweater and beige shirt, beige pants and a prosthetic leg.