"Jack Smart...changed the course of philosophy of mind. He was a pioneer of physicalism – the set of theories that hold that consciousness, sensation and thought do not, as they seem to, float free of physicality, but can – or will eventually – be located in a scientific material worldview...Smart agreed with old-fashioned mind-body dualism – against behaviourism – that many mental states are indeed episodic, inner and potentially private; what he disputed was that this made their essential nature non-physical."