 Subsequent debates have taken place at several other universities.Participants in the debate, held within the format of a symposium, have included past University of Chicago president Hanna Holborn Gray, philosopher Martha Nussbaum, former Council of Economic Advisers Chairman Austan Goolsbee, Nobel Prize winners Milton Friedman, George Stigler, Leon M. Lederman, and essayist Allan Bloom.A compendium of the debate, which has never been won, was published in 2005.