A native of Cork City Ireland, Mark O Sullivan moved to Sweden in 1994 and soon began collaboating with various Swedish musicians while at the same time developing his inquisitiveness fro mixing acoustic and electronic soundscapes. In 1999 Mark set up the dub orientated label KING SYNDROME SOUNDS where he released a set of much sought after 10" and 2 albums under his Mighty Quark moniker. The success of this project led to a network of worldwide collaborations and remixes with the likes of Leftfield, Digi Dub, Susumo Yokota, Olaf Hund and releasing on labels such as Play, Guidance, Les Labels, Brique Rouge. During this time Mark met up with his future DK7 partner Jesper Dahlbäck. They collaborated on a few releases for the influental label Svek. The first DK7 release was the ubiquitous "The Difference" on the influential UK record label Output. This first release literally was the sound of summer 2003 on dance floors all over the world. 2 more singles preceeded the highly acclaimed "Disarmed" album (8/10 N.M.E). On the strength of the album and having charted with 3 top 20 UK dance singles, DK7 set off on tour in October 2005, a tour that took in many high profile festival appearances (Roskilde, Pukklepop, Mysterylands etc).
While all this was happening Mark also found time to set up ORK Recordings in 2005 with house legends Fish Go Deep and more recently due to the succes of his Mark and John project on such high profile labels as Audiomatique and Pickadoll. Mark has also set up JM recordings with John Dahlbäck. Mark more recently has also taken on remix duties for Paul Woolfords smash Erotic Discourse. His latest reworking of Mike Mondays "What Day Is It" on Brique Rouge is already a becoming a firm favourite on the floor as is his own take on the DK7 track "Life Is Everywhere." Mark has recently done a series of DJ mixes which have been aired on BBC, Proton Radio and national radio in Canada, Holland, France, Sweden, Denmark and Ireland. With “Prayers”, his debut on Plastic City, Mark O Sullivan is returning to his dubby roots that made up an intrinsic part of him as a producer.