Last week in The New Yorker, Nation columnist Katha Pollitt confessed at length about web-stalking the lover who left her for a younger art critic. Pollitt never named the man, but she published enough clues that friends would know who it is -- and anyone who cared could figure it out. So the New York Observer did: He is Paul Mattick, a Marxist professor of philosophy at Adelphi University. His new girlfriend "seems to be Katy Siegel, an assistant professor of art history at Hunter College and a contributing editor of Artforum." (New York Observer, scroll down to "Katha Pollitt, S.W.F.")