He became known to audiences as a judge on the television singing competition The X Factor (UK). He won the second season of The X Factor with Shayne Ward in 2005.
He managed some of Ireland's most successful pop performers, including Boyzone and Johnny Logan.
He appeared on several reality series, including You're a Star, Popstars, and Britain's Got Talent.
He married Caroline Flack in September 2012.
He began managing Aston Merrygold's band, JLS, in 2009.