Isaiah Berlin (1909-1997) was one of the most important thinkers of the twentieth century. A fellow of All Souls College, Oxford, he was the author of many books, including Against the Current, The Crooked Timber of Humanity, and The Roots of Romanticism (all Princeton). Henry Hardy, a Fellow of Wolfson College, Oxford, is one of Isaiah Berlin's literary trustees. He has edited several other volumes by Berlin, and is currently preparing Berlin's letters and remaining unpublished writings for publication.