Simon is the project lead for ZAP an OWASP Open Web Application Security Project. He has a developer background and originally built the tool to help developers build better applications. The tool was so good that it caught the eye of the security community and is now used by developers, people just getting into security and veteran pen testers. You can follow him on Twitter @psiinon and find out more on the tool by going to the project site on OWASP.