Roy Thomas Baker

Producer, active 1970's to the present. Baker began career at Decca in England aged 14. Moved to Trident Studios. After co-founding Trident's record company Neptune, Baker began working with Queen whom he produced for five albums including the song "Bohemian Rhapsody".
Baker has produced and added his distinctive sound to artists such as The Cars, Ian Hunter, Nazareth, Guns N' Roses, The Who, The Rolling Stones, David Bowie, Foreigner, Journey, Ozzy Osbourne, Mötley Crüe, T.Rex, Devo, The Stranglers, Dusty Springfield, Yes, Cheap Trick, Gasolin', The Darkness and The Smashing Pumpkins.
Own studio: RTB Recording Studio

RTB in runout etchings does stand for Roy Thomas Baker, but it isn't currently interpreted as a credit on Discogs; it is a mark of quality assurance, indicating that Baker was present in the studio. (discussion)