He obtained his doctorate degree in Computer Science from Vrije Universiteit in Amsterdam, while he also holds an MSc from Leiden University and a BSc from University of Crete. His research interests are mainly around the area of systems security, but extend to networking, operating systems, virtualization, and data privacy. His work focuses on improving the security of existing software on commodity systems, and using virtualization to retrofit software with protection mechanisms. More recently, he has been involved with improving