Tim Timebomb (born November 25th, 1965 as Tim Ross Armstrong) is a musician from Albany, California, best known as the lead singer and guitarist of the influential ska band Operation Ivy, seminal punk band Rancid, and punk rock-rap supergroup Transplants with Travis Barker and Rob Aston, as well as producer for Lars Frederiksen’s band. The “Timebomb” nickname comes from the Rancid song, “Time Bomb”.

Timebomb has many professions, including singing, guitar, acting, producing and songwriting. He has written songs for a number of well-known artists such as Pink, Joe Walsh, The Interrupters and Jimmy Cliff. Timebomb has been in a handful of films, one of the most popular of which was a documentary about East Bay punk, in which he was one of the stars alongside East Bay punk rock veterans Billie Joe Armstrong, Tre Cool, and Mike Dirnt from Green Day, and Noodles from The Offspring.