The Proper Study of Mankind: An Anthology of Essays, Henry Hardy and Roger Hausheer (eds.), London: Chatto and Windus; New York, 1998: Farrar, Straus and Giroux; 2nd ed., London: Vintage, 2013 [1997].  

From the Publisher:

“Isaiah Berlin was one of the leading thinkers of our time and one of its finest writers. The Proper Study of Mankind brings together his most celebrated writing: here the reader will find Berlin’s famous essay on Tolstoy, “The Hedgehog and the Fox”; his penetrating portraits of contemporaries from Pasternak and Akhmatova to Churchill and Roosevelt; his essays on liberty and his exposition of pluralism; his defense of philosophy and history against assimilation to scientific method; and his brilliant studies of such intellectual originals as Machiavelli, Vico, and Herder.”

Online:
Amazon