 In much the same way that Russell used logic in an attempt to clarify issues in the foundations of mathematics, he also used logic in an attempt to clarify issues in philosophy. As one of the founders of analytic philosophy, Russell made significant contributions to a wide variety of areas, including  metaphysics,  epistemology,  ethics  and political theory. His advances in logic and metaphysics also had significant influence on Rudolf Carnap and the  Vienna Circle.  