Rich Costey is an American record producer, mixer and engineer,

who works in several musical genres, including hip-hop, rock, pop, indie, and electronica. As a producer, Costey's credits include Sigur Rós, Frank Turner, Muse, Foster the People, Swirlies, Santigold and Biffy Clyro. He has occasionally worked as a DJ and musician on these albums as well. He has been managed by René Symonds at Tap Mgmt since 2022

Source: Wikipedia (https://en.wikipedia.org/wiki/Rich_Costey)