 Besides the Turtle Island Quartet, which has released fifteen albums, Summer has played with many other crossover artists.He was a member of the Jazz Chamber Trio with the pianist Alon Yavnai and the Grammy-winning clarinetist Paquito D'Rivera which played primarily Latin jazz.He has also composed pieces for solo cello, including "Kalimba" and "Julie-O", (both the solo and duo versions), the last of which has become very popular among cellists and was included in a 2015 advertising campaign for the Apple Watch.