Mark Duane Morton (born November 25, 1972) is the lead guitarist of the American 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.
Mark 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.