Scott Mainwaringis chairperson of the Government Department at the University of Notre Dame. He is the author of The Party System and Democratization in Brazil and The Catholic Church and Politics in Brazil, 1916-1985 and coeditor of Presidentialism and Democracy in Latin America and Building Democratic Institutions: Party Systems in Latin America.Arturo Valenzuelais professor of government and director of the centre for Latin American Studies at Georgetown University. Scott Mainwaringis chairperson of the Government Department at the University of Notre Dame. He is the author of The Party System and Democratization in Brazil and The Catholic Church and Politics in Brazil, 1916-1985 and coeditor of Presidentialism and Democracy in Latin America and Building Democratic Institutions: Party Systems in Latin America.Arturo Valenzuelais professor of government and director of the centre for Latin American Studies at Georgetown University.