This book pays homage to an eminent professor, renowned researcher, and electoral expert, Pascal Perrineau. The texts bought together here are representative of his major scientific interests, the transformations of democracy and the rise of populism. Over the course of his career, he defended a vision of political science as open to other disciplines, knowledge, and methods, keeping dogmatism at bay. He taught generations of young citizens about political life and instilled in them the importance of understanding its mechanisms and principles. Through their contributions to this book, the authors express their gratitude and friendship toward Pascal Perrineau, who was director of the Sciences Po Center for Political Science (CEVIPOF) until 2013, professor at Sciences Po until 2018, and now president of Sciences Po Alumni.