Brendan O'Brien (born June 30, 1960) is an American record producer, mixer, engineer, and musician. He has worked with many groups and artists during his career, such as AC/DC, Pearl Jam, Stone Temple Pilots, Soundgarden, Red Hot Chili Peppers, Bob Dylan, Rage Against the Machine, and Bruce Springsteen. O’Brien was also credited on a plethora of nu metal albums with such artists as Korn, Limp Bizkit, Incubus, and more.

Source: Wikipedia (https://en.wikipedia.org/wiki/Brendan_O%27Brien_(record_producer))