Juan Vazquez is one of the software developers of Rapid7 who is an active exploit developer for the Metasploit Framework.
Ajay Singh Negi is a security researcher and a bug bounty hunter who has over 45 Hall of Fames for his responsible disclosures which include Google, Paypal, Twitter, Etsy, Dropbox, Adobe, Barracuda Labs, Coinbase, etc.
Muhammad Mujtaba a.k.a mushti is a Pakistani security researcher and bug bounty hunter who has been listed in the Hall of Fames of Google, AT&T, MailChimp, Coinbase, PayMill, ConstantContact, Viadeo, GitLab, Wizehive, Snappy, and Sellfy.
Has worked as a PHP Developer & Drupal Developer.
Philippe Gamache is a PHP contributor since 1999 and the co-author of the PHP security book 'Sécurité PHP 5 et MySQL 5'. He is the president of Parler Haut, Interagir Librement a company that does Security Audit and Penetration Testing for PHP web applications.
David Hulton a.k.a h1kari specializes in 802.11b Wireless Security development specifically to exploit its various inherent design weaknesses. He is the main developer of the bsd-airtools project, a complete 802.11b penetration testing and auditing toolset, that implements all of the current methods of detecting access points as well as breaking WEP on them and doing basic protocol analysis and injection.
Vlatko Kosturjak is a Croatian security consultant who contributes to OpenVAS, Nessus, nmap and snort (to name a few). He spoke at various regional conferences in Europe on Croatian and English language.
Jerome Athias is a French Coder, information security professional, and security researcher who is an early contributor to projects like the Metasploit Framework and Rainbow Tables projects.
Rafal Los has presented at events produced by OWASP, ISSA, SecTor, Black Hat, Defcon, and SANS and many others. Staying active and contributing to the community - he participates in OWASP, is a key liaison to the Cloud Security Alliance and other industry groups. Owner of the blog 'Following the White Rabbit'.
Alexander Meisel is an OWASP Germany member and one of the major contributors to OWASP’s whitepaper “Best Practices Guide: Web Application Firewalls,” which was released by the OWASP Germany Chapter has been translated into English, French, and Chinese. He is a regular speaker at OWASP conferences and meetings world wide mostly with a focus on web application security, scalability and performance.