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Stefan Esser

Stefan Esser is an independent Security Consultant, that is well known in the security community for his advisories about popular Open Source Software packages like Linux, NetBSD, Samba, Cyrus IMAPD, Gaim, Ethereal, CVS, Subversion, MySQL and PHP.
He is also known as the first who completely broke the DRM of the Microsoft XBOX with software only exploits.

Stefan contributes to the source code of PHP for 5 years and was a founding member of's Security Response Team until he retired from it in the end of 2006. Because of his indepth knowledge of the PHP source code, he is an excellent auditor for PHP web applications, with a background knowledge that is unique in the PHP community.
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