. >> host: jennifer rattner rosen hagan, you have written a biography of friedrich nietzsche. are you a fan? >> guest: if i may, i would say -- people call it a biography of friedrich nietzsche, but it's actually a biography of his ideas as they come to life in america, so one of the things i say the book is that, this is not actually book about nietzsche. in fact, some readers have been disappointed. he crops up quite a bit, but the book is not about nietzsche. on the american historian american intellectual historian and my interest is that history of american thought culture over 19th and 20th century. what i discovered is when you get to the late 19th century and through the 20th century you cannot talk about american intellectual life without talking about nietzsche's curious presence and his influence. anyways, just a modest correction here. it's not about nietzsche it's about as, so every reading of nietzsche, not listening whether clarence darrow or walter kaufmann who comes so important to redeeming each after world war ii or need or rather alan bloom are getting him