My general field of expertise is film history/theory/criticism, and my specialties are 1) film and the Holocaust, and 2) the blacklist in Hollywood during the 1940s and 50s. You can see my resume and publications at http://www.linkedin.com/pub/joshua-hirsch/8/203/b83.
My main contributions to Wikipedia are Istvan Szabo and Levi Olan.
I've also been contributing to/monitoring lists of Jews (focusing on film directors) and articles dealing with the Holocaust in Hungary.