At Bob Belden's suggestion, I picked up Otto Friedrich's City of Nets, a massive tome about the golden age of Hollywood. It is packed full of good information, but the author's dry writing style doesn't exactly make it a page-turner.
There is a chapter about European, mostly Jewish, composers who fled Europe during Nazi Oppression and came to Hollywood, Schoenberg among them.
I did not know until I read the New Yorker piece that Leonard Rosenman studied with Schoenberg, or that James Dean was Rosenman's piano student, or that Dean got Rosenman to score his films. Good information.