This unnamed doctor was a member of the Atlantis expedition. In 2007, he was treating Ronon Dex in the infirmary after the Asuran Stargate satellite's beam had hit the city. He was trying to remove large piece of glass from Ronon's chest safely, but his hesitation displeased Ronon. Later, he explained to Ronon about the seriousness of Dr. Elizabeth Weir's condition.
As one of the 20 or so people who had the ATA gene left on the base, he was called in to fly a Puddle Jumper in order to clear the way for Atlantis through an asteroid belt. He was reluctant as he had only flown a Jumper twice before and had never actually fired a live drone, but along with everyone else, had no choice due to the seriousness of the situation. Working together, the doctor and the other pilots successfully cleared a path for Atlantis through the asteroid belt. (SGA: "Adrift")