Isaiah Berlin was one of the greatest thinkers of the twentieth century - and a man who set ideas on fire. His defence of individual liberty and cultural variety was passionate and persuasive, and inspired a generation. His ideas - especially his reasoned rejection of political despotism and all forms of excessive certainty - have become even more prescient and vital today. But Berlin himself published very little of his work and needed an intellectual impresario. In Search of Isaiah Berlin tells the compelling story of a decades-long collaboration between Berlin and his principal editor, Henry Hardy, who made it his vocation to bring Berlin's huge body of writings into print. Hardy discovered that Berlin had written far more than people realised, most of it unknown. As he describes his struggles with Berlin, who was almost on principle reluctant to have his work published, an intimate and revealing picture of the self-deprecating philosopher emerges. This is a unique portrait of a man who gave us a new way of thinking about the human predicament, and whose work had for most of his life remained largely hidden from view.