Bluejay: Musical Child Prodigy

Jay Greenberg signed his compositions "Bluejay" because that particular bird was small and made a lot of noise -- just like him. Jay says that music came to him, fully composed all the time. He couldn't turn it off. His professors say they had never seen anything like it before, and in terms of historical context, nothing like his talent had been seen or heard since the likes of Mozart, Mendelssohn or Saint-Saens.

His father, Robert Greenberg, is a professor of Slavic languages at Yale University. His Israeli-born mother also has no musical background, but Jay found himself attracted to music from an early age, having begun playing the cello at the age of two.

Although i haven't found it not clearly written it seems obvious that he is Jewish.