Maxwell R Bennett is Emeritus Professor of Neuroscience and held the first University Chair for ‘research recognized internationally to be of exceptional distinction’ at the University of Sydney. This research is on the biophysics and neurobiology of synapses. He is the author and c0-author of over 300 papers as well as of thirteen books on the neuroscience, history and philosophy of this subject. In the last twenty years he founded The Brain and Mind Research Institute, as well as The Mind & Neuroscience Thompson Institute, each concerned with ameliorating mental illness.  Peter Hacker is Emeritus Fellow of St John's College, Oxford and holds an Honorary Professorship at University College, London at the Institute of Neurology. He is a leading authority on the philosophy of Wittgenstein, has written extensively on philosophy and neuroscience, philosophy of language, philosophy of mind, and the philosophy of human nature. He is author and co-author of more than twenty-five books.