Jonne Kamphorst is pursuing a PhD in Political Science at the European University Institute in Florence. At Stanford, he is a Fulbright Visiting Scholar. He has earned an MPhil and MSc in politics and sociology from the University of Oxford and the London School of Economics, and he did his bachelor’s in Political Science at the University of Amsterdam. Jonne’s work focuses on voting behaviour, political parties, and political persuasion. The first part of his doctoral thesis asks why the preferences of voters have changed in advanced democracies. The second part of his thesis focuses on what politicians and parties can do to persuade radicalized, polarized, and disengaged voters to come back to the political mainstream. Jonne is thus particularly interested in the extent to which the numerous interventions against these potentially harmful phenomena are effective. He is exploring these topics using a selection of methods that employ an experimental logic, specifically (field) experiments and methods of causal inference.