Multiple realities(covers information from several alternate timelines)
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Tom Purser was a Starfleet officer in the 24th century.
In 2354, he was listed as a Starfleet Operational Support Services officer on a directory placard at Starbase 32, Maxia sector. His office was located in room #44398. (TNG: "Violations", directory)
In an unknown, alternate future timeframe, he was listed as an Engineering Division officer on the dedication plaque of the USS Pasteur. (TNG: "All Good Things..." dedication plaque)
He was named after construction coordinator Tom Purser.