Maine Coon
Posner and his wife, Charlene Horn, have lived in Hyde Park, Chicago, for many years. His son Eric Posner is also a prominent legal scholar and teaches at the University of Chicago Law School. Posner is a self-described "cat person" and is devoted to his Maine Coon, Pixie. Posner appeared with his previous cat, a Maine Coon named Dinah, in a photograph accompanying a lengthy profile (of Posner) in "The New Yorker" in 2001.