Multiple realities
(covers information from several alternate timelines)

Mark Stimson was a Starfleet officer in the 24th century.

In 2374, he was listed as a Research and Development officer on a dedication plaque for the USS Prometheus. (VOY: "Message in a Bottle", dedication plaque)

In an unknown, alternate future timeframe, he was listed as an Advanced Technologies officer on the dedication plaque of the USS Pasteur. (TNG: "All Good Things..." dedication plaque)

This character was only mentioned in writing.
He was named after special effects artist Mark Stimson.
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