Saul Vallejos Calzada is a senior researcher in the Department of Chemistry at the Universidad de Burgos (Spain). He received his PhD in chemistry in 2014 (on sensory polymer chemistry). He carried out postdoctoral stays in the Institute of Molecular Biology at the Universidad Miguel Hernández (Elche, Spain) and in the Department of Chemistry at the Universidade de Coímbra (Portugal). Dr. Vallejos is a co-author of 40+ peer-reviewed scientific publications and 20 patents, along with a co-author of books and book chapters. His principal research areas are high-performance materials, functional polymers, and sensory polymers as sensing materials for food, biomedical, environmental, and civil security applications.