 He also serves as a professor of history and the humanities at Cooper Union and is a contributor to numerous publications, including The "New York Post" (where he has a weekly column), "The New Republic", "The Atlantic Monthly", "Commonweal’’, "Tikkun", and "TELOS".In the past he has served as the political advisor to several political candidates in New York City, including former Mayor Rudolph Giuliani.He is the author of several books, including "The Prince of the City