Dan is a security consultant and vulnerability researcher at Virtual Security Research, where he performs application and network penetration testing, conducts code reviews, and identifies vulnerabilities in third-party software. He has reported and corrected dozens of vulnerabilities in popular open source and commercial applications, including more than 50 vulnerabilities in the Linux kernel. He also contributes on the defensive side by submitting kernel patches that implement proactive security features. His current research interests include exploit development, kernel hardening, and mobile security.