Lars Erik Frederiksen (born August 30, 1971) is a Danish-American guitarist and vocalist, most notably for the punk rock band Rancid, and as the frontman of Lars Frederiksen and the Bastards and The Old Firm Casuals. He was also briefly a member of the UK Subs in 1991. He joined Rancid in 1993 after the band was searching for a second guitar player and was present on their second album Let's Go. He has produced albums for bands such as Agnostic Front, The Business, Dropkick Murphys, Swingin Utters, Anti-Heros, Patriot, The Forgotten, Harrington Saints, and Pressure Point. He recently mixed Charged GBH's new album entitled Perfume and Piss, as well as Cock Sparrer's album "Here We Stand" both alongside Michael Rosen.