Currently, his research interests are in American political development, race and politics, and social welfare policy and the welfare state. Lieberman is the author of Shifting the Color Line: Race and the American Welfare State and has edited a volume on race in American politics. He has also written several articles that have appeared in the American Political Science Review, Political Research Quarterly, and Social Science History, such as "Race, Institutions, and the Administration of Welfare," "Social Construction," and "Looking Inward, Looking Outward: The Politics of State Welfare Innovation Under Devolution."