Michael Hanagan has taught at Vanderbilt and Columbia Universities and has long experience in teaching undergraduate history. He currently teaches courses in world history, global history and international studies at Vassar College. He is the author of several books, including The Logic of Solidarity and Nascent Proletarians. He has edited a number of collections. Most recently he edited (with Chris Tilly) Contention and Trust in Cities and States. He is also finishing a manuscript with Miriam Cohen on the comparative history of the welfare state in England, France and the United States between 1870 and 1950. He served as senior editor for the journal International Labor and Working-Class History for four years, has been on the Consulting Board of Theory and Society for the last seven. He is currently a co-editor of the series Cambridge Studies in Contentious Politics. He is currently working on an essay on world history for the UNESCO Encyclopedia of Life Support Systems.