Daniel Mellado holds a PhD and MSc in Computer Science from the Castilla- La Mancha University (Spain) and holds a degree in Computer Science from the Autonomous University of Madrid (Spain), and he is Certified Information System Auditor by ISACA (Information System Audit and Control Association). He is Assistant Professor of the Department of Information Technologies and Systems at the Rey Juan Carlos University (Spain). He participates at the GSyA research group of the Department of Information Technologies and Systems at the Castilla- La Mancha University. He is civil servant at the Spanish Tax Agency (in Madrid, Spain), where he works as IT Auditor Manager. His research activities are security governance, security requirements engineering, security in cloud computing, security in information systems, secure software process improvement and auditory, quality, and product lines. He has several dozens of papers in national and international conferences, journals, and magazines on these subjects and co-author of several chapter books. He belongs to various professional and research associations (ASIA, ISACA, ASTIC, ACTICA, etc.).