Descartes is possibly the most famous of all writers on the mind, but his theory of mind has been almost universally misunderstood, because his philosophy has not been seen in the context of his scientific work. Desmond Clarke offers a radical and convincing rereading, undoing the received perception of Descartes as the chief defender of mind/body dualism. For Clarke, the key is to interpret his philosophical efforts as an attempt to reconcile his scientific pursuits with the theologically orthodox views of his time.