In a fourpart series, Dr. David M. PeñaGuzmán discusses Nietzsche's Genealogy of Morality. In this opening lecture, he discusses the Preface and what we learn from it about Nietzsche's genealogical approach to moral themes. What is genealogy? How does it differ from a more typical historical account? How does it differ from evolutionary narratives? Special attention is paid to Nietzsche's remarks about Paul Rée's prosocial theory of moral sentiments.