Timothy Ross Armstrong (born November 25, 1965) is an American musician, songwriter, and producer. He is best known as the singer/guitarist for the punk rock band
Rancid and
hip hop/punk rock supergroup the
Transplants. Prior to forming Rancid, Armstrong was in the influential
ska punk band
Operation Ivy. In 1997, along with
Brett Gurewitz of the band
Bad Religion and owner of
Epitaph Records, Armstrong founded
Hellcat Records. In 2012, through his website, Armstrong started releasing music that influenced him, along with stripped-down cover songs of his own work under the name
Tim Timebomb. He has released at least one song per week since late 2012. Armstrong is also an accomplished and sought-after songwriter for other artists. Armstrong won a Grammy Award for his work with
Jimmy Cliff and
Pink and he has also worked with
Gwen Stefani and
Joe Walsh.