Apostolos Mastoris is an ethical hacker working as a security consultant at MWR InfoSecurity in London. His interest in security began when he was involved in the 2600 meetings in Athens, Greece. His day-to-day activities include application and infrastructure penetration testing and consulting clients on ways to improve the security of their environments. He holds a BSc in computer engineering and an MSc in information security. In his free time (when there's any), he enjoys reading recent updates in the security community, doing some coding, and getting involved in problem solving activities.