Giorgio Agamben has emerged as one of the most perceptive and even prophetic political thinkers of his era. Now that he has completed his career-defining work - the multivolume Homo Sacer series - Adam Kotsko, one of his leading translators, shows how his political concerns emerged and evolved as Agamben responded to contemporary events and new intellectual influences while striving to remain true to his deepest intuitions. Kotsko reveals the trajectory of Agamben's work and shows us what it means to practice philosophy as a living, responsive discipline.