Mark Arm (born Mark Thomas McLaughlin; February 21, 1962) is an American singer and songwriter, best known as the vocalist for the grunge band Mudhoney. His former group, Green River, was one of the first grunge bands, along with Malfunkshun, Soundgarden, Skin Yard, the U-Men, and others. He is also the manager of the Sub Pop warehouse and previously worked at Fantagraphics Books.