Harrie de Swart is a Professor Emeritus of Logic and Analysis of Language at the Faculty of Philosophy of Tilburg University, The Netherlands. He studied Mathematics and Physics at the Catholic University of Nijmegen, The Netherlands, with a specialization in logic, foundations, and philosophy of mathematics. De Swart holds a PhD in mathematical logic from the same university. After 50 years of experience with teaching logic and 25 years of teaching social choice theory, he authored a book on ""Philosophical and Mathematical Logic"" (Springer, 2018) and another book on Social Choice Theory, together with Stefan Wintein. Stefan Wintein is an Associate Professor in Theoretical Philosophy at the Faculty of Philosophy of the Erasmus University Rotterdam, The Netherlands, and a member of the Erasmus Institute for Philosophy and Economics. He holds a PhD in logic from Tilburg University, The Netherlands, an MSc in Econometrics, and a MA in Philosophy. His research focuses on philosophical logic (self-referential truth, many-valued logics) and formal ethics (fairness, distributive justice). He teaches social choice theory, logic, and philosophy to economics students.