Scottish musician best known as the keyboardist for alternative rock band Snow Patrol. Simpson quit the band in 2013.
He began deejaying at the age of 17, performing at clubs in Dundee, Scotland.
He didn't begin playing keyboards until he was in his late 20s.
He earned a degree in drawing and painting at the Duncan of Jordanstone College of Art and Design.
He and guitarist Nathan Connolly were bandmates in Snow Patrol.