The idea that there is a distinctively practical use of reason, and correspondingly a distinctively practical form of knowledge, unites many otherwise diverse voices in the history of practical philosophy: from Aristotle to Kant, from Rousseau to Marx, from Hegel to G.E.M. Anscombe, and many others. This volume gathers works by scholars who take inspiration from these and many other historical figures in order to deepen our systematic understanding of questions raised by their work that still are, or ought to be, at the center of contemporary philosophical debate: the form and nature of practical reasoning, agential self-consciousness or practical knowledge, how knowledge of the good relates to our motivational capacity, and the shape of philosophical thinking about sound forms of living together. Accordingly, the volume is divided into three parts: action theory, meta-ethics, and political philosophy. This fusion of perspectives delivers novel possibilities not only for answering the systematic questions outlined above, but also for understanding both what unifies and distinguishes those historical voices that have sought to articulate the concept of practical reason.