Bill (or Wil) Thoms was a member of Starfleet in the 24th century.
In 2353, Thoms was listed on a directory placard as having an office in room 53964 on Starbase 32. (TNG: "Violations")
In 2365, he held the rank of captain, and was the commanding officer of the USS Lexington. (TNG: "The Measure Of A Man")
His name was also listed on a USS Voyager crew manifest in 2371. (VOY: "Projections")
Thoms, who was listed on a piece of background artwork, was named for special effects artist Wil Thoms.