Moxie Marlinspike is the founder of Open Whisper Systems which is both a large community of Open Source contributors, as well as a small team of dedicated developers. Together, the members of Open Whisper Systems is working to advance the state of the art for secure communication, while simultaneously making it easy for everyone to use.
Moxie works on secure protocols, Android clients, and server software. He has been contributing to Open Whisper Systems since it was Whisper Systems, formerly ran the product security team at Twitter, started the first cloud-based password cracking service. He has also published a number of attacks on secure protocols like SSL and MS-CHAPv2.
He has been a keynote speaker at past OWASP and other security conferences.