Mark Thomas Tremonti (born April 18, 1974) is an American musician and singer-songwriter, best known as the guitarist of the post-grunge band Creed and lead guitarist of the alternative metal band 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 2012, releasing the album All I Was. The band's sophomore album, Cauterize, was released in June 2015.