I wrote a couple of chapters for the new, very big textbook on American politics published by Cengage Learning. American Governance is the name of the volume. The electronic version of the text is now available. I wrote the chapters on immigration and geographic mobility and sorting. I don't provide much in the way of new, original research, but I think I gave a nice, short summary of both topics and explained their relevance to politics. If anyone is interested, I can e-mail a .pdf of my chapters.