Jack's Mannequin is a piano rock ban from Orange County, California. A side project of Andrew McMahon, originally from Something Corporate, the band was formed in 2004 and released their first album in August 2005. In June of that year, McMahon was diagnosed with late stage acute lymphoblastic leukemia, but made a full recovery. His album, Everything in Transit, was received with positive response by fans and critics. They are currently signed to Sire Records.