John O'Callaghan (born 21 September 1982), is an Irish musician and DJ, who mainly produces trance music. He also produces music under the aliases of Joint Operations Centre, Mannix, Henrik Zuberstein, and Stenna. He has 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 tracks are "Exactly" with Bryan Kearney, "Big Sky", in collaboration with vocalist Audrey Gallagher, and "Find Yourself" (feat. Sarah Howells). O’Callaghan has received remixes by trance artists such as The Thrillseekers, Sean Tyas, Gareth Emery, Cosmic Gate, Markus Schulz and Indecent Noise. He has also worked with Heatbeat and Aly & Fila.
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Achievements
O'Callaghan formerly had the majority of his work released on Discover, the British record label set up by John Askew. Later, 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, O'Callaghan entered the DJ Mag 100 at number 60 and picked up two awards at the Irish Dance Music Awards, winning Best Producer and Best DJ. John also became the first Irishman to play Trance Energy. In 2009, he rose 36 places to 24th in the DJ Mag 100.