|Homeworld||born aboard USS Lyra|
|Posting||USS Pioneer (2376)|
|Relatives|| Hanne Lindholm (mother)|
Thomas O'Reilly (father)
O'Reilly was born aboard the USS Lyra in 2338, two years after the marriage of his parents, Lieutenant Hanne Lindholm and Lieutenant junior grade Thomas O'Reilly. While having families with children aboard starships was not especially common at this time, the three initially opted to remain aboard the Lyra. O'Reilly was only in his third year on the ship, but Lindholm was a particularly distinguished officer who had been posted to the Lyra since her graduation from Starfleet Academy in 2332. The year before Scott's birth, she had been named as Second Officer.
In 2340, Thomas O'Reilly was transferred to Starbase 11. Lindholm and their son moved with him, but after about a year, she returned to starship duty. Scott remained with his father until 2349, the year after his mother was promoted to Captain and gained command of the USS Ballard. He spent three years there with his mother before joining his father on Earth. Thomas O'Reilly had recently been appointed as an instructor at Starfleet Academy and Scott lived with him while he went to school until he himself entered the Academy. Early on, O'Reilly pursued the science track, majoring in astrophysics and exobiology. He met Adriana Watley on the Academy quad during his fourth year.
After graduating in 2360, Ensign O'Reilly's first assignment was on the USS Zenith in the stellar cartography department. Although he had planned for years for a career in the sciences, after a few years on the Zenith, he became interested in the operations and command side of starship duty. He was promoted to lieutenant junior grade in 2363 and granted a transfer to operations officer. A year later, O'Reilly moved to the USS Pauling to become the assistant chief of operations. Another promotion, to full lieutenant, followed in 2365. The next year, O'Reilly advanced to a dual position of chief operations officer and second officer. Three years later, in 2369, O'Reilly left the Pauling and transferred to the USS Knossos to become first officer there. He spent three years in that position as a lieutenant commander and four more as a commander before gaining his own command.