Dr. Jennifer Keller is a fictional character from the Canadian-American military science fiction series Stargate Atlantis, a spin-off series to Stargate SG-1. She is played by Canadian actress Jewel Staite, who previously played the Wraith Ellia in season two episode "Instinct". She was created by the producers, who wanted someone to fill in for Carson Beckett after Paul McGillion's departure from regular status in the series. Keller had a recurring role in the fourth season, and was later promoted to a regular in Season 5.