This book examines Immanuel Kant's impact on moral philosophy from his time to our own. Kant's moral philosophy can seem complicated, but at the most basic level it is driven by the simple idea that the greatest possible freedom for each combined with an equal degree of freedom for all is the fundamental principle of philosophy. Kant's Impact on Moral Philosophy is a worthy successor to the Invention of Autonomy. Guyer pushes far beyond the usual narrative according to which Kant's greatest impact was on the German Idealists and Rawls(ians). His book will be of great interest to Kant scholars and Kantian ethicists, as well as to scholars who are curious about the Kantiandebts of many significant 19th- and 20th-century ethicists.