From Halopedia, the Halo wiki
Chris Hughes is also a former Bungie Studios employee.
Chris got his start as a computer graphics artist in 1993 with Unexpected Development, where he worked on several games for different platforms.
At Bungie he worked as a concept artist, character, object and environment modeler for the game Oni, Modeling important characters such as Mai Hasegawa.
After his work on Oni, worked as an artist and modeler for Halo: Combat Evolved. He created the original look and models for Cortana and 343 Guilty Spark, among other things. Where Chris Hughes' inspiration for Cortana was Nefertiti, and 343 Guilty Spark's silhouette shape came from a paper toilet seat sanitary cover.
Chris also worked on Captain Jacob Keyes and the form he took in the Proto-Gravemind, the Marines, the Jackal, minor touch ups to the spikes and gun on the Hunter, the Aggressor Sentinel, and the Human Flood Combat form.