Barry Buzan is Emeritus Professor in the Department of International Relations at the London School of Economics and Political Science, a Senior Fellow at LSE IDEAS and a Fellow of the British Academy. Among his books are International Systems in World History (2000, with Richard Little); Regions and Powers (Cambridge, 2003, with Ole Wæver); From International to World Society? (Cambridge, 2004, with Ole Wæver); The Evolution of International Security Studies (Cambridge, 2009, with Lene Hansen) and An Introduction to the English School of International Relations (2014).