This revised second edition of our bestselling "Key Guide" includes brand new entries on some of the most influential thinkers of the twentieth and twenty-first century: Zizek, Bergson, Hussen, Heidegger, Butler, and Haraway. With a new introduction by the author, sections on phenomenology and the post-human, full cross-referencing and up-to-date guides to major primary and secondary texts, this is an essential resource to contemporary critical thought for undergraduates and the interested reader.