Pete Wentz (real name - Peter Lewis Kingston Wentz III) is the bassist, back-up vocalist, and primary lyricist of Chicago-based band Fall Out Boy. He was born on June 5, 1979 in Wilmette, Illinois, a suburb of Chicago.

Wentz was primarily involved in the Chicago hardcore punk scene and was in several bands in the late 1990s. These included First Born, Extinction, Arma Angelus (alongside Tim McIlrath, frontman of Rise Against), Yellow Road Priest, and Racetraitor.

In 2002, Fall Out Boy released an EP called Fall Out Boy/Project Rocket Split EP. Soon after, in 2003, the band released Fall Out Boy's Evening Out with Your Girlfriend on Uprising Records.

He also has a film production company called Bartskull Films, which put out the DVD Release the Bats, which stars Wentz, his fellow bandmates, and several of his personal friends. The sequel is currently in the works.

On February 6, 2008, it was reported that Wentz was the leading candidate for writer Diablo Cody's follow-up film to Juno. The movie is said to be about an emo-band, with Wentz playing the role of the frontman of the band. The other two candidates are said to be Joel Madden of Good Charlotte and One Tree Hill's Chad Michael Murray.

On February 24, 2008, Wentz appeared in comedian Jimmy Kimmel's video "I'm F*cking Ben Affleck" as a chorus member (along with many other celebrities). The video was in response to one made by Kimmel's girlfriend, Sarah Silverman, "I'm F*cking Matt Damon".

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