He is a founding member of British electronic music group Underworld and an acclaimed composer, having collaborated extensively with director Danny Boyle,[1] most notably as the musical director for the London 2012 Summer Olympics Opening Ceremony,[2] alongside Underworld's Karl Hyde.

[4] Smith left a bank clerk job in Llanelli to do an electronic and electrical engineering degree; however, he dropped out during his finals after being asked to join Hyde’s band The Screen Gemz.

In 1987, Smith and Hyde formed Underworld, and the pair are the longest and only original serving members of the musical project, still performing together today.

As part of Underworld, Smith scored the soundtrack for Boyle's stage production of Frankenstein in 2011, and in 2012 undertook a solo venture creating the soundtrack to Boyle's film Trance.

[1] Smith was appointed the musical director for the 2012 Summer Olympics opening ceremony which was directed by Boyle.