Charles Seaford is head of the Centre for Well-Being at the New Economics Foundation (nef) think-tank, where he leads work to make well-being the explicit aim of public policy. But how do we define well-being, and how can philosophy help us? Charles discusses the new politics of well-being, contrasting Aristotle and Jeremy Bentham's differing visions of happiness. Before joining nef, Charles worked at the UK government’s Sustainable Development Commission where he advised on a range of sustainable development policy and communications issues. He previously worked in management consultancy, specialising in strategic change and moral purpose and co-writing a book on moral purpose in business. He co-founded Prospect Magazine, a leading political and intellectual monthly magazine and earlier in his career worked as an equity analyst in the City and as a branding consultant.