John Viega has done a bunch of things that people either loved or hated. He co-developed the most common cipher mode (AES-GCM), wrote the first book for developers on security, did the first two static analysis tools for security, and, before he discovered security, wrote the Mailman mailing list manager. He is co-founder and CEO of Crash Override, and was co-founder and CEO of Capsule8 prior to that.