Manuel Santos-Trigo completed his doctorate in mathematics education at the University of British Columbia, Canada. He is a full Professor at the Centre for Research and Advanced Studies, Cinvestav-IPN, in Mexico City. He teaches graduate courses in the mathematics education Department and does research in mathematical problem solving and the use of digital technologies. His current research project involves characterizing teachers and students' problem-solving reasoning in scenarios that include the systematic and coordinated use of digital technologies and online developments.