These sites offer detailed information on the relationship between German exiles and émigrés and American (Hollywood) culture. In particular, you will find many figures who defined their careers from 1933-1948. All sites listed here are in English.
The German-Hollywood Connection
A huge source of information related to German exiles and émigrés in Hollywood from the beginning of the twentieth century to the present. The site includes short essays on particular topics (i.e., Casablanca), biographies of a variety of figures, bibliographies, and filmographies. The links page is extensive and well-organized.
Emigrants of the German Movie
This one-page site includes biographies of a handful German exiles and émigrés who had successful careers in the United States. The scanned photographs are of the highest quality, and the filmographies for each person are incredibly comprehensive.
Exiled German Intellectuals in Los Angeles
The University of Southern California dedicated this site to literary figures and public intellectuals from Germany who spent their time as exiles in Los Angeles. You will find biographies of people like Vicki Baum, the Homolkas, and Erich Maria Remarque here. The page is an extension of the Feuchtwanger Memorial Library.
The German Émigré Collection
Connected to SUNY-Albany's M.E. Grenander Department of Special Collections and Archives, this site has an impressive listing of exiled German intellectuals' papers, correspondence, and publications. You cannot access the material on-line, but the brief descriptions of the work by these figures will lead you to other helpful sources.