Doctor Chen was working at the Sedran Colonial Guard at the time of the biological attack on Sedra. When the hospital was flooded with people as results of the bomb, he did his best to help people effected by the biological substance.
At one time he was found by nurse Laura Daoud partially fallen onto the ground and he was bleeding from the face. She and several ONI personnel helped him out and walked him out of the room.
He then gave her orders to now register people anymore in the medical database, and to keep everything on paper only. His last known order to her was to leave the hospital with several ONI agents to a Sedran firebase where they have decontamination chambers set up.
- Halo: Nightfall (Mentioned only)