Mark Jago is Professor of Philosophy in the Faculty of Arts at the University of Nottingham. A philosopher and logician, his research spans metaphysics, logic, philosophy of language, philosophy of mind, and social philosophy. His recent work focuses on impossible situations and how we reason about them, truth and truthmaking, and the fundamental structure of reality, including essence, material objects, and levels of reality. He has also published on vagueness, relevant logic, and modal accounts of knowledge, much of it connected to Truthmaker Semantics. His books include The Impossible (2014), Reality Making (2016, ed.), What Truth Is (2018), and Impossible Worlds (2019, with Franz Berto), all published by Oxford University Press.