Leader of the OWASP Access Control Rules Tester Project. Not very active leader though.
Contributor of the OWASP Secure Coding Practices - Quick Reference Guide. Speaker at OWASP AppSec 2008 in Belgium: "Detecting Security Vulnerabilities in Web Applications Using Dynamic Analysis with Penetration Testing"
My linked-in profile: http://linkedin.com/pub/andrey-petukhov/9/13/398