 He has a PhD in sociology from Duke University.Author or editor of more than 150 scholarly articles and chapters and 18 books, Bean's research focuses on international migration, unauthorized migration, U.S. immigration policy, and the demography of the U.S. Hispanic population.A member of the Council on Foreign Relations, he has been a Guggenheim Fellow and held numerous visiting scholar positions (at the Russell Sage Foundation, the Transatlantic Academy, the American Academy in Berlin, the Research School of Social Sciences at the Australian National University, and the Center for U.S./Mexico Studies at the University of California at San Diego).