Carlos Guardado da Silva is Ph.D. in Medieval History (2004), by the University of Lisbon, and Aggregate in Information Science (2016) by the University of Coimbra. He’s researcher at Centre for Classical Studies of the University of Lisboa, professor and director of the master’s degree in Documentation and Information Sciences, at School of Arts and Humanities of the University of Lisbon. He’s also member of the ISKO (International Society for Knowledge Organization) - Iberian Chapter. He is a member of the Sociedade Portuguesa de Estudos Medievais (SPEM, Portuguese Society of Medieval Studies), Academic of the Portuguese Academy of History (APH), member of the Joaquim Veríssimo Serrão Research Centre, and member of the Associação Portuguesa de Ciências da Comunicação (SOPCOM, Portuguese Association of Communication Sciences). He is Secretary of the General Assembly of the BAD – Associação Portuguesa de Bibliotecários, Arquivistas, Profissionais da informação e Documentação (Portuguese Association of Librarians, Archivists, Information and Documentation Professionals), and Secretary of the Board of the Iberian Chapter of ISKO - International Society for Knowledge Organization. He is also a member of the Consulting Council of the Historical Route of the Lines of Torres. He is (co)author of more than two hundred titles (books, book chapters, papers, critical reviews, and prefaces), within the scope of History, Cultural Heritage, and Information Science, of which stands out the book Investigação em Ciência da Informação (Lisbon, Colibri, 2019), which integrates the collection CI - Ciência da Informação (Information Science), under his direction.