Xavier Mertens is a freelance cyber security consultant based in Belgium. His daily job focuses on protecting his customer's assets by applying "offensive" (pentesting) as well as "defensive" security (incident handling, forensics, log management, SIEM, security visualisation, threat hunting, OSINT). Besides his daily job, Xavier is also a security blogger (https://blog.rootshell.be), a SANS Internet Storm Center Senior Handler (https://isc.sans.org) and co-organizer of the BruCON (http://www.brucon.org) security conference.