Justin Holt's research interests include distributive justice, social policy, political economy, and the welfare state. His first book Karl Marx's Philosophy of Nature, Action, and Society (Cambridge Scholars Press, 2009) examined how Marx's philosophy of nature shaped his critique of capitalism. His next book The Social Thought of Karl Marx (Sage, 2014) will be an introduction to Marx's ideas for advanced undergraduates and graduate students in philosophy and the social sciences. He has also published articles on John Rawls and G.A. Cohen. His current project is focused on integrating philosophic and social scientific approaches to the topics of inequality, unemployment, poverty, political friendship, environmental decay, and economic democracy. He teaches courses on the history of social and political philosophy, problems of distribution, philosophy of economics, and theories of the welfare state.