American Idol that season, but left after just one season. On January 11, 2010, Simon Cowell left the show to pursue introducing the American version of his show "The X Factor" for 2011. Jennifer Lopez and Steven Tyler joined the judging panel in the tenth season, but both left after two seasons. They were replaced by three new judges, Mariah Carey, Nicki Minaj and Keith Urban, who joined Randy Jackson in the twelfth season. However both Carey and Minaj left after one season, and Randy Jackson departed the show after twelve seasons as a judge but would return as a mentor. Urban
Peter Jackson (judge) Peter Jackson (judge) Sir Peter Arthur Brian Jackson, PC (born 9 December 1955), styled The Rt Hon Lord Justice Jackson, is an English Appeal Court judge. Previously he was a High Court Judge assigned to the Family Division. Jackson was called to the Bar by the Inner Temple in 1978 and became a Queen's Counsel in 2000. He was subsequently appointed as a Recorder in 1998, a Deputy High Court Judge in 2003 and a High Court Judge with effect from 1 October 2010. Referring to his work as a barrister (not as a judge), Chambers & Partners described Jackson