Mark Duane Morton (born November 25, 1972) is an American musician who is the lead guitarist and one of the founding members of the heavy metal band Lamb of God.

Morton grew up near Williamsburg, Virginia. His first band was Axis, which was composed of other local youth, one being Ryan Lake of Alabama Thunderpussy fame. Morton played rhythm guitar. The band became a popular local act winning the local battle of the bands competition, known as Stockwood, in 1988.

Morton, Chris Adler, and John Campbell met in 1990 at Virginia Commonwealth University where they were floor mates. Several years later, they formed a band under the name « Burn the Priest ». Morton soon left to pursue a master’s degree, and the band added guitarist Abe Spear, and vocalist, Randy Blythe. After a couple years apart, Morton rejoined the group and Burn the Priest released a self titled full-length album. He was credited as « Duane » on the album « New American Gospel » Lamb of God’s first major release.

In December 2018, Morton announced his solo debut album, Anesthetic to be released on March 1, 2019, through Spinefarm Records. A single from the album titled « The Truth Is Dead » was released following the announcement and features Morton’s Lamb of God bandmate Randy Blythe as well as Arch Enemy frontwoman Alissa White-Gluz on vocals. The album also features a posthumous collaboration with late Linkin Park frontman Chester Bennington, which was teased all the way back to April 2017. The song titled « Cross Off » was released as the album’s second single on January 8, 2019.