Multiple realities
(covers information from several alternate timelines)
Bill George was a Starfleet officer in the 24th century.
In 2372, he was named among the Research & Development test listed on the dedication plaque of the USS Enterprise-E. (Star Trek: First Contact, dedication plaque)
In an unknown, alternate future timeframe, he was listed as a member of the Advanced Technologies team 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 ILM model maker and visual effects art director Bill George.