Ex-CIA director David Petraeus is replacing one kind of intelligence work with another. Macaulay Honors College at City University of New York says the retired four-star general has been named a visiting professor for public policy, starting in August. Petraeus, who left the CIA after an extramarital affair was exposed last fall, has a doctorate from Princeton University and has written widely on international relations, military strategy and tactics, and national security issues. He says in a statement released by Macaulay that he's pleased to teach at the college, where most students are the children of immigrants. He says he looks forward to leading a seminar on the global economic slowdown.