John O'Callaghan is an Irish Musician and DJ, mainly producing electronic dance music. He also produces music under the alias of Joint Operations Centre, Mannix and Stenna. He has also collaborated with fellow Discover artists such as Bryan Kearney, Neal Scarborough (as Inertia), Thomas Bronzwaer (as Lost World) and Greg Downey as well as more recently, trance hero Leon Bolier. His best known track is Big Sky, done with vocalist Audrey Gallagher.AchievementsJohn O'Callaghan formerly had the majority of his work released on Discover, the British record label set up by John Askew. Recently, his work has been released by Armada Music and its sublabels; primarily on Armind and Soundpiercing. The remix of his vocal trance production "Big Sky" by Agnelli & Nelson was voted “Tune of The Year” by listeners of Armin van Buuren's A State of Trance radio show in 2007.In 2008, not only did John enter the DJ Mag 100 in 2008 at number 60 but he also picked up two awards at the 'Irish Dance Music Awards', winning 'Best Producer' and 'Best DJ'. With the success of 2008 flowing, John also became the first Irishman to play Trance Energy. In 2009, he rose 36 places to 24th in the DJ Mag 100.In addition to numerous single releases, he has released a live album (Discover "Live As" Volume 2) and two artist albums, Something To Live For and Never Fade Away.