Conversation so far:
What was one of the first things Andrew Breitbart wrote?
Andrew Breitbart discovered that he loved writing, publishing his first comedic piece in the school newspaper, the Brentwood Eagle, analyzing the inequality in his high school's parking lots.
What was the book Hollywood, Interrupted about?
Hollywood, Interrupted: Insanity Chic in Babylon - The Case Against Celebrity, by Mark Ebner, Andrew Breitbart, focuses primarily on the disconnected, self-indulgent nature of Hollywood culture.

Question: What kind of research did he do?
Self-contained rewrite: What kind of research did Andrew Breitbart do?