Graham Priest is Distinguished Professor of Philosophy at the City University of New York Graduate Center. His books include: In Contradiction (1987, 2006), Beyond the Limits of Thought (1995, 2002), Introduction to Non-classical Logic (2001, 2008), Towards Non-being (2005, 2016), Doubt Truth to Be a Liar (2006), One (2014), and The Fifth Corner of Four (2018).