Stephen Mumford is Professor of Metaphysics in the Department of Philosophy and Dean of the Faculty of Arts at the University of Nottingham, UK. He is the author of Dispositions (OUP, 1998), Russell on Metaphysics (Routledge, 2003), Laws in Nature (Routledge, 2004), David Armstrong (Acumen, 2007), Watching Sport: Aesthetics, Ethics and Emotions (Routledge, 2011), and Getting Causes from Powers (OUP, 2011) with Rani Lill Anjum). He was editor of George Molnar's posthumous Powers: a Study in Metaphysics (OUP, 2003).
Matthew Tugby is Teaching Fellow at the University of Birmingham. Previously, he worked as Doctoral Researcher on the UK Arts and Humanities Research Council's Metaphysics of Science Project, based at the University of Nottingham. He has since published on the topic of dispositions and works on a range of issues at the intersection of metaphysics and the philosophy of science.