AT: "xx" David Livingston was a Starfleet officer in the 24th century.
As early as 2363, he was a flag officer with the rank of vice admiral. (TNG: "The Wounded", dedication plaque)
In the 2360s, he was listed as a Fleet Administration officer on the dedication plaques of Nebula-class starships. (TNG: "The Wounded", dedication plaque; TNG: "Redemption II", dedication plaque)
In an unknown, alternate future timeframe, as an admiral, he was listed as a Starfleet Command officer on the dedication plaque of the USS Pasteur. (TNG: "All Good Things..." dedication plaque)
He was named after production staff member David Livingston.