Londregan is a specialist in the development and application of statistical methods in political science. He has also done extensive analysis of Chilean legislative and electoral politics since the transition from the Pinochet dictatorship to democracy. Londregan is the author of Legislative Institutions and Ideology in Chile, as well as a contributor to numerous journals and edited volumes. He received the Miller Prize for Best Paper in Political Analysis, Vol. 8 in 2000. Ph.D., Princeton University.