To commemorate the journal's quarter-century, this double issue consists of foundational pieces arranged in conversation with one another. Common Knowledge has opened lines of communication among schools of thought in the academy, as well as between the academy and the community of thoughtful people outside its walls, and the pages of the journal challenge the ways we think about scholarship and its relevance to humanity. Contributors to the issue include former presidents, prime ministers, and archbishops, along with winners of the Nobel Prize, Man Booker Prize, Pulitzer Prize, National Book Award, Mellon Foundation Distinguished Achievement Award, MacArthur Fellowship, International Balzan Prize, and Holberg International Prize. Contributors. M. H. Abrams, Edward Albee, Barry Allen, Wayne Andersen, Kwame Anthony Appiah, Sir Isaiah Berlin, Marianna Birnbaum, Sir John Boardman, G. W. Bowersock, Aldo Buzzi, Caroline Walker Bynum, Anne Carson, William M. Chace, J. M. Coetzee, Cornelius Castoriadis, Stanley Cavell, Stuart Clark, Inga Clendinnen, Francis X. Clooney, Christopher Coker, Maria Conterno, Michael Cook, Lorraine Daston, Lydia Davis, Natalie Zemon Davis, Thibault De Meyer, Gunter Eich, Sir John H. Elliott, Caryl Emerson, Mikhail Epstein, Péter Esterházy, Roger Cardinal Etchegaray, Fang Lizhi, Paul Feyerabend, Michael Fried, Joseph Frank, Manfred Frank, Luis Garcia, Clifford Geertz, Carlo Ginzburg, Philip Gossett, Stephen Greenblatt, Thom Gunn, Jürgen Habermas, Ian Hacking, Václav Havel, Sir Edward Heath, Albert O. Hirschman, David Hollinger, Darrel Alejandro Holnes, Miroslav Holub, Maya Jasanoff, Albert R. Jonsen, Stanley N. Katz, Hugh Kenner, Sir Anthony Kenny, Sir Frank Kermode, Jee Leong Koh, Joseph Leo Koerner, Yusef Komunyakaa, György Konrád, Bruce Krajewski, László Krasznahorkai, Anton O. Kris, Julia Kristeva, Bruno Latour, Ewa Lipska, Greil Marcus, Steven Marcus, Samuel Menashe, Adam Michnik, Jack Miles, Alexander Nehamas, Reviel Netz, Sari Nusseibeh, Jeffrey M. Perl, Marjorie Perloff, J. G. A. Pocock, W. V. Quine, Belle Randall, Nadja Reissland, Colin Richmond, Richard Rorty, Ingrid Rowland, Hanna Segal, Amartya Sen, Quentin Skinner, Barbara Herrnstein Smith, A. L. Snijders, Timothy Snyder, Susan Sontag, Isabelle Stengers, Wis'awa Szymborska, Miguel Tamen, G. Thomas Tanselle, Sir Keith Thomas, Stephen Toulmin, Anna Lowenhaupt Tsing, Michiko Urita, Bas van Fraassen, Marina Vanzolini, Gianni Vattimo, Helen Vendler, Charlie Samua Veric, Eduardo Viveiros de Castro, Sir Bernard Williams, Lord (Rowan) Williams, H. R. Woudhuysen, Grzegorz Wróblewski, Santiago Zabala