Dhia Mahjoub Dr. Dhia Mahjoub is Head of Security Research at Cisco Umbrella. He works with his team on building large-scale threat detection and threat intelligence systems, driving new product features and supporting major business deals in the US, Europe, and APAC. He has 15+ years experience in network security, has authored patents with OpenDNS and holds a Ph.D. in graph data analysis. Dhia has been supporting law enforcement through his investigation of cybercrime and speaking about it at the Europol-INTERPOL Cybercrime Conference, the Dutch NCSC One Conference and the SANS CTI Summit. He has given keynotes at KPMG and Orange security events and is a frequent speaker at conferences worldwide including Black Hat, Defcon, Virus Bulletin, RSA, FS-ISAC and FIRST. He's also on the program committee of Botconf and the ACM DTRAP journal.