James Joseph Chamberlin (born June 10, 1964) is an American drummer and record producer. He is best known as the drummer for the alternative rock band The Smashing Pumpkins. Following the 2000 breakup of the band, Chamberlin joined Pumpkins frontman Billy Corgan in the supergroup Zwan and also formed his own group, the Jimmy Chamberlin Complex. In 2005, Chamberlin joined Corgan in reforming The Smashing Pumpkins; he eventually left the group in March 2009, though he returned again in 2015 for a summer tour. He performed in the group Skysaw until 2012. He is currently active under the Jimmy Chamberlin Complex name. In addition to his current work as CEO, Chamberlin has joined Chicago jazz saxophonist Frank Catalano for a string of 2013–15 performances in the Chicago area. An EP by Catalano and Chamberlin Love Supreme Collective - EP was released on the 29th of July 2014.
Chamberlin, who originally trained as a jazz drummer, cites jazz musicians Benny Goodman, Duke Ellington, Gene Krupa, and Buddy Rich, as well as rock drummers Keith Moon, Ian Paice, and John Bonham as major influences on his technique. While he is known as "one of the most powerful drummers in rock," he primarily strives for emotionally communicative playing. In 2008, Gigwise named Chamberlin the 5th best drummer of all time.