Columbia Records | Guinness World Records | Atlantic Records | Decca Records | Mercury Records | Warner Bros. Records | Epic Records | RCA Records | Capitol Records | MCA Records | Virgin Records | Arista Records | Island Records | Elektra Records | Universal Records | Stax Records | Geffen Records | A&M Records | Reprise Records | Naxos Records | Polydor Records | Philips Records | London Records | Interscope Records | Rise Records | Liberty Records | Blue Note Records | Roadrunner Records | MGM Records | CBS Records |
Dempsey became general manager in 1978 of Epic Portrait Associated (Epic Records, Portrait Records and CBS Associated Labels Group) succeeding Ronald Alexenburg who would leave CBS to head up Infinity Records.
His work includes many major releases on Festival's Infinity Records label (not affiliated with the U.S. based MCA Records subsidiary label also called Infinity Records.) He worked on all the early albums and singles for Sherbet, Australia's most successful pop band of the early-mid-1970s, and the first five LPs by renowned singer-songwriter Richard Clapton.