Born in France, and educated in Canada and the UK, Gregory Claeys is Professor of the History of Political Thought at Royal Holloway, University of London. A historian of British radicalism and socialism from 1750 to the present, he is the author of eight books and editor of some fifty volumes, mostly of primary sources. He has written studies of Robert Owen and Owenism, Thomas Paine, and John Stuart Mill, as well as of utopianism. He has been visiting professor at the Australian National University, Keio University, Tokyo, the University of Hanoi, and Peking University.