Marta Bunge is Professor Emerita of Mathematics at McGill University, Montreal. She is the author (with Professor Jonathon Funk) of the book Singular Coverings of Toposes (2010). Bunge is also a member of the editorial boards of the Cahiers de Topologie et Geometrie Differentielle Categoriques and of the Tbilisi Mathematical Journal.
Felipe Gago is Professor of Mathematics at the University of Santiago de Compostela, Spain.
Ana María San Luis is Professor of Mathematics at the University of Oviedo, Spain.