Annalisa Coliva is Full Professor, Chancellor Fellow, and Chair of the Department of Philosophy at the University of California, Irvine, USA. Her books include Moore and Wittgenstein: Scepticism, Certainty and Common Sense (2010), Extended Rationality: A Hinge Epistemology (2015), and The Varieties of Self-Knowledge (2016). With Maria Baghramian she is author of Relativism (Routledge, 2019). Duncan Pritchard is Distinguished Professor of Philosophy and Director of the Center for Knowledge, Technology & Society at the University of California, Irvine, USA. His books include Epistemic Luck (2005), The Nature and Value of Knowledge (with Millar and Haddock, 2010), Epistemological Disjunctivism (2012), Epistemic Angst (2015), Scepticism: A Very Short Introduction (2019), and What Is This Thing Called Knowledge? (4th edn, Routledge, 2018).