He has also been a visiting professor in the UK, France, Germany, and Singapore. He is the author of Great Transformations: Economic Ideas and Institutional Change in the Twentieth Century and is currently working on three projects: a book on party politics and political economy in advanced welfare states called The New Political Economy of Party Politics, an edited volume on constuctivist theory and political economy entitled Constructivist Political Economy, and a series of papers on probability, randomness, and epistemology in the social sciences, which may or may not end up a book. His articles have appeared in Comparative Politics, World Politics, Perspectives on Politics, and Comparative European Politics.