A native Texan who now resides in Seattle began his musical life at the age of 7 playing classical piano. His interest in music grew through various instruments; electric bass, electric and acoustic guitar, keyboards, and now the touch guitar.
He has toured and recorded with Sunday All Over The World, Toni Childs, Robert Fripp String Quintet, The, David Sylvian, Vernon Reid, Michael Brook, Eric Johnson (2), John Paul Jones, David Hykes of Harmonic Choir, The and King Crimson.
In 1992 he was asked to join David Sylvian and Robert Fripp in a collaborative project that grew from a three-piece to a fully-fledged rock band, touring Japan and Europe in both configurations. The band released "The First Day" and a live album, "Damage". Trey also found time to record his first solo album "One Thousand Years" released on Discipline Records.
He has been a member of King Crimson since 1994. For his role in this configuration of the group (Belew, Fripp, Gunn and Mastelotto), Gunn has helped evolve a new and unique instrument. Built by Mark Warr of Warr Guitars this 'tapped' instrument is an 10-string touch guitar with the range of a piano.