The 15 Most Influential People in Security Today - 5. Michal Zalewski, Google
Before joining the search marketing giant as an information security engineer, Michal Zalewski launched an all-out assault on the security models of modern Web browsers, exposing critical vulnerabilities in Microsoft's Internet Explorer and Firefox. His public disclosure of those flaws went a long way to hardening the browsers. Now a member of Google's security team, he continues to find and report bugs in Apple's Mac OS X and to use his hacking skills to help secure Google's long list of Internet-facing products.