Michel Foucault continues to be hugely influential. His diagnoses challenge us to rethink crucial phenomena such as madness, discipline, the human sciences, the state, neoliberalism, sexuality and subject formation. Based on his work in its entirety, and with special emphasis on his many recently published lecture series, this book provides an updated, comprehensive and original account of his thought. By reading Foucault as a philosopher, it offers an extensive systematic assessment and discussion of his unique conception of philosophical practice and brings a unifying trajectory in his work to light.