Juhani Yli-Vakkuri, Professor in Philosophy of Language, University of Tartu, and John Hawthorne, Professor of Philosophy, University of Southern California

Juhani Yli-Vakkuri is Professor in Philosophy of Language at the University of Tartu and Alexander von Humboldt Research Fellow at the University of Bielefeld, having previously been Postdoctoral Research Fellow at the Centre for the Study of Mind in Nature (CSMN), University of Oslo. He is the author of several papers in the philosophy of language, the philosophy of mind, epistemology, and philosophical logic, as well as co-editor, with Mark McCullagh, of Williamson on Modality (Routledge, 2017).

John Hawthorne is Professor of Philosophy at the University of Southern California, and a Fellow of the British Academy. He was previously Waynflete Professor of Metaphysical Philosophy at the University of Oxford and Professor of Philosophy at Rutgers, the State University of New Jersey. His books include Knowledge and Lotteries (OUP 2004), Metaphysical Essays (OUP 2006), Relativism and Monadic Truth (OUP 2009, with Herman Cappelen), and The Reference Book (OUP 2012, with David Manley).

"This important book on narrow content is presented as a third act in what might be called the Twin Earth Wars ... the next-generation externalists Juhani Yli-Vakkuri and John Hawthorne aim to strike down internalists on behalf of the empire once and for all, deploying the awesome weapon Mirror Man to give an argument that narrow content is impossible ... Philosophers on both sides of the issue can be grateful to Yli-Vakkuri and Hawthorne for invigorating a debate that had been threatening to go stale, and for setting an agenda for further work." - David J. Chalmers, Notre Dame Philosophical Reviews

"This is a book for students and scholars of philosophy of mind and philosophical psychology... Recommended." - CHOICE

"This is one of the most convincing philosophy books I have read in a long time. It takes a widely held constellation of views, lays them out with admirable clarity, and patiently reduces them to rubble." - Jeff Speaks, University of Notre Dame