He combines activities in both the television and music industries.
Cowell has produced and promoted singles and albums for various singers that he has taken under his wing.
Cowell returned for a fourth series on 18 August 2007 alongside Osbourne, Walsh and new judge, Dannii Minogue.
Walsh had previously been sacked from the judging panel by Cowell for the fourth series, and was subsequently replaced by Brian Friedman, who was a judge on Grease Is the Word.
However, the show returned in 2010, and has since performed strongly on the Seven Network.
Cowell also launched The X Factor USA in September 2011 on American broadcaster Fox. Cowell's act Melanie Amaro won the season, making Cowell the winning judge.
It was originally announced that he would be a judge both on the UK and US editions of the show, which air at similar times of the year, He was joined by Paula Abdul, L. Cowell and Reid returned for season 2, while Demi Lovato and Britney Spears joined the judging panel as replacements for Abdul and Scherzinger.
Cowell returned for a third season of The X Factor in September 2013 alongside Demi Lovato, while Britney Spears and L. Reid announced they would not be returning and were replaced by Kelly Rowland and Paulina Rubio.
This resulted in the cancellation of the US version after three seasons by Fox.
He joined judges Louis Walsh, Cheryl Fernandez-Versini, and new judge, former Spice Girls member Mel B (who replaced Nicole Scherzinger).
With his notoriously critical reputation, Cowell is likened to TV personalities such as Judith Sheindlin, and Anne Robinson of her show.
Cowell's prominence grew, fed by his signature phrase, "I don't mean to be rude, but ...", inevitably followed by an unsparingly blunt appraisal of the contestant's talents, personality, or even physical appearance.
He passed English Language and Literature, and then attended Windsor Technical College where he gained another GCE in Sociology.—but did not get along well with colleagues and bosses, until his father, who was an executive at EMI Music Publishing, managed to get him a job in the mail room.