Zwan is Billy Corgan (vocals/guitar), Matt Sweeney (guitar), David Pajo (bass), and Jimmy Chamberlin (drums)
Billy Corgan formed his previous band, The Smashing Pumpkins in 1988. Smashing Pumpkins split in 2000, and in 2001 Billy Corgan formed Zwan.
Matt Sweeney led the New Jersey punk group Skunk during the end of the eighties into the early nineties. In the nineties, he formed Chavez with Clay Tarver, Scott Masciarelli, and James Lo.
David Pajo, originally from Kentucky, is formerly of the Steve Albini group Slint. In the decade following Slint's breakup, he toured with Stereolab, Royal Trux, King Kong, Palace, and Will Oldham. Pajo joined the Chicago outfit Tortoise in 1996. He is currently a member of the band Papa M (previously known as Aerial M) and continues to work with them while in Zwan.
Jimmy Chamberlin was, as mentioned above, also one of the founding members of Smashing Pumpkins. The Smashing Pumpkins was the first rock band he joined. Apart from a brief periode in the late nineties, he played with the Pumpkins until they split in 2000. Following the band's breakup, he collaborated on the album The Last Hard Men with Skid Row's Sebastian Bach, The Breeders' Kelley Deal, and Jimmy Flemion of The Frogs.