Timothy Lockwood 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.