She is a graduate of Carnegie Mellon and has a Ph.D. Her first appearance was of one half of the protagonist team in Half-Life: Decay.Īccording to Decay, Green is a 37 year old Research Associate with level 4 security clearance assigned to the Anomalous Materials Laboratory in the Black Mesa Research Facility. Colette Green ( left) along with Gina Cross ( right)ĭoctor Colette Green is a fictional character in the Half-Life series of first-person shooter computer games.