Reality TV's Craziest Stars
Known to American Idol fans as "Mr. Nasty," British record executive Cowell began his industry career in the EMI Music Publishing mailroom before creating U.K.'s The X Factor in 2004. Serving as a judge on American Idol from 2002-2010, Cowell also appeared as a judge on the U.S. X Factor, Britain's Got Talent and Pop Idol. Cowell signed One Direction to his Syco Records in 2011.