Maurice Salles is Professor (emeritus) of Economics at the University of Caen-Normandy (France). He was coordinating editor of the Springer journalSocial Choice and Welfarefrom 1984 to 2011 and President of the Society for Social Choice and Welfare in 2012/13. He is Editor-in-Chief of the Springer book series "Studies in Choice and Welfare". Moreover, Maurice is honorary research associate at CPNSS at the London School of Economics and member of the Murat Sertel Center at Bilgi University in Istanbul. He is presently working on the history of social choice theory, on (im)possibility of social choice with Nash independence of irrelevant alternatives and on the mathematical methods of social choice and voting theory.

Marc Fleurbaey  is CNRS researcher and Professor at Paris School of Economics and Ecole normale supérieure (France). Until June 2020, he was Robert E. Kuenne Professor of Economics and Humanistic Studies and Professor ofPublic Affairs at Princeton University (USA). Author of Beyond GDP (with Didier Blanchet, OUP 2013), A Theory of Fairness and Social Welfare (with François Maniquet, CUP 2011), and Fairness, Responsibility and Welfare (OUP, 2008), he is one of the initiators of the International Panel on Social Progress, and lead author of its Manifesto for Social Progress (CUP 2018). He is a former editor of Social Choice and Welfareand Economics and Philosophy. He is Editor-in-Chief of the Springer book series "Studies in Choice and Welfare".