From Linkin Park Wiki
Andrew Murdock, better known as Mudrock, is an American record producer and audio mixer specializing in the rock and metal music genres.
Mudrock is best known for production on Godsmack's albums, such as Godsmack and Awake. More recently, he has produced successful Avenged Sevenfold albums, such as Waking the Fallen and City of Evil. He has produced albums for Slunt, The Riverboat Gamblers, Powerman 5000, 18 Visions, Alice Cooper, Unloco, and Dave Reffett. He has also produced 50 Foot Waves' EP, Power and Light.
He also contributed to Linkin Park's early Hybrid Theory EP in May 1999, when the band was earlier known as Hybrid Theory. He has also contributed to Linkin Park's Songs from the Underground EP in 2008, containing several tracks from the Linkin Park Underground EPs, including Hunger Strike by Temple of the Dog frontman Chris Cornell that features a surprise appearacne from Chester Bennington of Linkin Park.
Mudrock is based in Los Angeles, and he has his own studio in partnership with Scott Gilman: The Hobby Shop. There, he;s become more involved with in local music communities, working with up-and-coming bands including Dante vs Zombies, Random Patterns, and Woolen.
Mudrock was interviewed and featured in Avenged Sevenfold's documentary DVD, All Excess.