An internationally famous philosopher and best-selling author during his lifetime, Georg Simmel has been marginalized in contemporary intellectual and cultural history. This neglect belies his pathbreaking role in revealing the theoretical significance of phenomena―including money, gender, urban life, and technology―that subsequently became established arenas of inquiry in cultural theory. It further ignores his philosophical impact on thinkers as diverse as Benjamin, Musil, and Heidegger. Integrating intellectual biography, philosophical interpretation, and a critical examination of the history of academic disciplines, this book restores Simmel to his rightful place as a major figure and challenges the frameworks through which his contributions to modern thought have been at once remembered and forgotten.