On the one hand, collective decision-making processes are modelled using game theory and the theoretical predictions are assessed by means of controlled laboratory experiments. On the other hand, the group develops concrete social-policy interventions in the Global South – currently for Bangladesh and Colombia – and evaluates their effectiveness using randomized field experiments. Sebastian Fehrler studied at the Freie Universität Berlin, the Humboldt-Universität zu Berlin, and the University of Nottingham. He completed his PhD at the University of Zurich. His last position was as an assistant professor at the University of Konstanz.