Stephen Mumford is Professor of Metaphysics at the Department of Philosophy, University of Nottingham, and Dean of the Faculty of Arts. He has written several books on this topic, including Dispositions (OUP, 1998), Laws in Nature (Routledge, 2004), Getting Causes from Powers (with Rani Lill Anjum, OUP, 2011), and Metaphysics: A Very Short Introduction (OUP, 2012). Rani Lill Anjum is Research Fellow at the Norwegian University of Life Science where she leads the Causation in Science research project (CauSci). CauSci is a global network for those interested in a scientifically informed philosophy of causation. She has written many popular articles in magazines and newspapers and delivered numerous talks for non-specialist audiences. She is the co-author of Getting Causes from Powers (OUP, 2011).