Matt Deis is an American musician and songwriter primarily known for his work in the rock and metal genres. He gained recognition as the bassist and backing vocalist for the band All That Remains from 2010 to 2015. Deis contributed to several of the band's notable albums, including "A War You Cannot Win" (2013) and "The Order of Things" (2015), which showcased a blend of melodic metalcore and hard rock. In addition to his work with All That Remains, Deis has been involved in various side projects and collaborations, often highlighting his versatility as a musician. After departing from All That Remains, he continued to work on new music and has engaged with fans through social media, sharing insights into his creative process. Deis's impact on music can be seen in his contributions to the evolution of modern metalcore, where he helped bridge elements of melody with heavier instrumentation. His work has influenced a new generation of musicians within the rock genre, contributing to the ongoing dialogue about the blend of technical proficiency and emotional expression in contemporary music.