Became known to audiences as a judge on the television talent competition show, The X Factor (UK) since the show's inception in 2004. He also judged on Britain's Got Talent, The X Factor (US) and Ireland's Got Talent.
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 was born to parents Maureen and Frank Walsh. He has several brothers and sisters.
He began managing Aston Merrygold's band, JLS, in 2009.