John Lechte 
Fifty Key Contemporary Thinkers [PDF ebook] 
From Structuralism to Post-Humanism

This revised second edition from our bestselling Key Guides includes brand new entries on some of the most influential thinkers of the twentieth- and twenty-first century: Zizek, Bergson, Husserl, 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.