I am not an entirely objective reader when it comes to the philosophy of Isaiah Berlin. I am a liberal by conviction and it would be difficult for me to identify any thinker of the 20th century who embodies liberal thought (as I understand it) better than Isaiah Berlin. Indeed, living as he did from 1909 to 1997, his lifetime encompasses that century almost precisely and was hugely influenced by its political events. But as Johnny Lyons shows in a most readable style, Berlin was not just a student of the history of ideas, but a product of that history as well as a significant contributor to it. If you want to get a sense, not only of the key elements of Isaiah Berlin's thinking, but of why it is important, you could scarcely do better than read this new book. An enormous amount has been written about Isaiah Berlin, and no-one has seen more of it, or indeed published more of it, than Henry Hardy, Berlin's principal editor and collaborator. "He sees Berlin plain, and therefore sees more in him than many others.........his account of Berlin will take its place as a permanent milestone in the history of that remarkable thinker." High praise, but entirely justified.