Roger Matthew Freeman, also known as Matt McCall, (born April 23, 1966) is an American musician best known as the bassist of punk rock band Rancid. After forming several bands with guitarist and vocalist Tim Armstrong in the late 1980s and early 1990s, including ska-punk pioneers Operation Ivy, he and Armstrong formed Rancid with drummer Brett Reed. The band's success helped revive mainstream interest in punk, and they have released ten albums since their formation. Freeman has several side projects as well, including Devil's Brigade, in which Freeman sings lead vocals and plays bass. Freeman's style is characterized by aggressive walking lines and fills, typically played on a Fender Precision Bass.