Mark Thomas Tremonti (born April 18, 1974) is an American guitarist and singer, best known for his tenures with the rock bands Creed and Alter Bridge. He is a founding member of both bands, and has also collaborated with many other artists over the years. He formed his own band Tremonti in 2011 and has released five albums with them, including A Dying Machine, which was adapted by Tremonti and science fiction novelist John Shirley.