He is a comparative historical soci- ologist interested in the study of class, politics, social movements, and institutional change. His book, Labor and the Class Idea in the United States and Canada (Cambridge University Press, forthcoming) explains diverging trajectories of working-class organizational power in the United States and Canada over the course of the twentieth century. Other research has been published in the American Sociological Review, Politics & Society, Sociology Compass, and Labor History, among other venues. He also comments regularly in various media outlets on labor politics and policy.