Celeste Rivers

Professor Celeste Rivers was a senior scientist working at the Pharos Institute.

Biography
She showed Sarah Jane Smith around the Institute, much to the dismay of Korst Gogg Thek Lutiven-Day Slitheen, then masquerading as the Human child prodigy Nathan Goss. (SJA: The Lost Boy)

She thanked Sarah Jane for not telling anyone about the incident with Nathan Goss which could have destroyed the institute, later unofficially she permitted Sarah Jane to take away a fragment of the Weserbergland Meteorite kept at the Institute. (SJA: The Day of the Clown)

Behind the Scenes
She will appear in series 3 and it will be bigger than her first two appearances. Though confirmed by the production team, her name has not been mentioned on-screen.