Up until the 1980s immigration-related subjects were largely ignored by comparative political scientists. It was only when they were politicized during the 1990s that political science scholarship on these subjects proliferated. The essays in this symposium expand upon the progress comparativists have made in comprehending and explaining the phenomena of mass immigration and immigrant settlement. Specifically, they explore several recent currents within their respective research streams, including issue salience, radical Right political parties, the domestic politics of immigration policy making, and national immigration regimes. All are intellectually indebted to the scholarship of Gary P. Freeman and Martin A. Schain to whom we dedicate this symposium.