Mostly Other People Do the Killing is a jazz quartet based in New York City including trumpeter Peter Evans, saxophonist Jon Irabagon, bassist Matthew "Moppa" Elliott, and drummer Kevin Shea.

Bandleader Moppa Elliott met Peter Evans while both were students at the Oberlin Conservatory of Music.

Performances often take the form of large suites in which the group transitions between original pieces and jazz standards, often employing theatrics and elements of rock, pop, and classical music.

[1] In 2009, Mostly Other People Do the Killing was the winner of the 57th Annual Downbeat Critics' Poll in the Rising Star Ensemble category.

Jon Irabagon was the winner of the 2008 Thelonious Monk International Jazz Saxophone competition,[3] and released his first album on the Concord Records label.