David has been involved in the field of networks and security for over 20 years. His professional career began designing systems for IBM, later as a hardware and software and security technical consultant in the UK, where he worked on the design and implementation of secure environments for many high-profile FTSE 100 clients. This experience has provided him with the skills to specialize in penetration testing, where he has performed offensive security testing in many environments for over 14 years. This includes testing complex infrastructures, web applications, hardware and software components to improve customer security.