This collection offers an overview of the thought of Murray Bookchin, today's foremost social theorist and political philosopher of the libertarian left. Best known for introducing ecology as a concept relevant to radical political thought in the early 1960s, Bookchin was the first to propose, in the body of ideas that he has called social ecology, that a liberatory society would also have to be an ecological one. His writings span five decades and a wide range of subject matter.