Nietzsche's "On the Genealogy of Morality" is one of the most widely read books of philosophy, by philosophers and non-philosophers alike. Many of the ideas Nietzsche raises such as 'the will to power', the 'slave revolt' in morality and perspectivism - are startling and disturbing and resonate in subjects as diverse as ethics, continental philosophy, literature and religion. Brian Leiter's "Nietzsche on Morality" is an outstanding introduction to Nietzsche's famous work and is essential reading for any student of Nietzsche. Clearly and compellingly argued, it also caused controversy amongst Nietzsche scholars for its emphasis on naturalism as the key to understanding the Genealogy, and is regarded as one of the most significant works on Nietzsche of recent years. In this second edition Brian Leiter revises and refreshes the book throughout. He has written a new preface; revised sections on key topics such as epiphenomenanlism and consciousness in light of important recent work on Nietzsche; and significantly expands his discussion of agency and free will in relation to Nietzsche's text. He also includes an important postscript on Nietzsche's naturalism in light of recent interpretations of Nietzsche.".