This book argues that the Russian-British philosopher Isaiah Berlin should primarily be understood through British idealism. Though he adopted Kantian methodology and a view of people as purposive beings, he rejected the Idealists' monism and theories of positive liberty. Robert A. Kocis demonstrates how, like Michael Oakeshott and R. G. Collingwood, Berlin can be seen as a 'post-Idealist' thinker, invested in the implications of that rich tradition.