Multiple realities(covers information from several alternate timelines)
Ronnie Knox was a Starfleet officer.
In 2372, he was named as a Research and Development officer on the dedication plaque on the USS Valiant. (DS9: "Valiant", dedication plaque)
In an unknown, alternate future timeframe, he was named as a Fleet Ops 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 chief lighting technician R.D. Knox