How Jewish is modern Jewish philosophy? The question at first appears nonsensical, until we consider that the chief issues with which Jewish philosophers have engaged, from the Enlightenment through to the late 20th century, are the standard preoccupations of general philosophical inquiry. Questions about God, reality, language, and knowledge - metaphysics and epistemology - have been of as much concern to Jewish thinkers as they have been to others. Moses Mendelssohn, for example, was a friend of Kant. Hermann Cohen's philosophy is often described as 'neo-Kantian.' Franz Rosenzweig wrote his...