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McGerr was a guest performer on Tegan and Sara's album The Con (Released July 2007). He can be seen recording in studio with them on the DVD entitled "The Con DVD" by Tegan and Sara. He also played drums for their album Sainthood (Released October 2009).
McGerr was previously in Krusters Kronomid and Eureka Farm as well as the Seattlejazz trio Rockin' Teenage Combo. McGerr is an instructor at the Seattle Drum School when not playing drums for Death Cab for Cutie. McGerr has also helped and mentored teen indie-pop group Smoosh.
After the opening of his studio, McGerr began working with Propellerhead, specifically Hayden Bursk of Drummerheads on an expansion pack for Reason 4. It's been dubbed "The Jason McGerr Sessions", and it is available as a ReFill from the propellerheads website and as a stand-alone from the Drummerheads website.
Speaking of McGerr in 2003, Benjamin Gibbard notes that he "definitely believe[s] this will be the last drummer we'll ever have. It's kind of come full circle. It makes more sense having him than it has anyone else that's ever played with us."