Vlatko Kosturjak help clients to reach desired security level(s). Durinh his carreer, he worked on bypassing security controls as well as on building ones. Beside security, his passion is open and free software, so he contributed code to various free security software like OpenVAS, Nmap and Metasploit. He is author of many (security) tools which are used today and they are available at github.com/kost