Ricardo Salles is a researcher at the Instituto de Investigaciones Filosóficas of the Universidad Nacional Autónoma de México. His recent books include: Los Filósofos Estoicos. Ontología, Lógica, Física y Ética (with Marcelo Boeri, 2014) and Alejandro de Afrodisias. De la Mixtura y el Crecimiento (with José Molina, 2020). He is the editor of Metaphysics, Soul and Ethics. Themes from the Work of Richard Sorabji (2005) and of God and Cosmos in Stoicism (2009).