 As perhaps the leading historical proponent of two important normative traditions—utilitarianism and liberalism—Mill occupies an unusually important position in the history of western moral and political philosophy. Viewed in historical context, both utilitarianism and liberalism have exerted considerable progressive influence on the scope of moral concern, the design of public institutions, the responsibilities of government, and the interests and rights of the governed. Mill did much to articulate the justification, content, and implications of utilitarian and liberal principles. Inevitably, there are questions about the proper interpretation, adequacy, and consistency of his various claims on these topics. But he has left an enduring legacy in both utilitarian and liberal traditions. Both traditions figure centrally in contemporary discussions of analytical ethical and political theory. Further progress in these traditions must take account of his contributions.