Cas Mudde (PhD, Leiden University) is Associate Professor in the School of Public and International Affairs at the University of Georgia (USA) and Researcher at the Center for Research on Extremism (C-REX) at the University of Oslo (Norway). His research agenda addresses the question: how can liberal democracies defend themselves against political challenges without undermining their core values? His recent book publications include On Extremism and Democracy in Europe (Routledge, 2016), SYRIZA: The Failure of the Populist Promise (Palgrave Macmillan, 2017), The Populist Radical Right: A Reader (Routledge, 2017), Populism: A Very Short Introduction (Oxford University Press, 2017), and The Far Right in America (Routledge, 2017). Many of his books have been published in Greek by Epikentro. He is regularly consulted by various media, NGOs and state institutions, is a columnist for HOPE not hate, and a regular op-ed contributor to international media (e.g. The Guardian, Huffington Post, New York Times). He tweets at @casmudde.