Stephen A. Ridley is a security researcher at Xipiter. He has more than 10 years of experience in software development, software security, and reverse engineering. Prior to Xipiter, Ridley served as the Chief Information Security O?cer of a financial services ?rm and prior to that was a Senior Researcher at Matasano. He also was Senior Security Architect at McAfee, and a founding member of the Security and Mission Assurance (SMA) group at a major U.S. defense contractor where he did vulnerability research and reverse engineering in support of the U.S. Intelligence Community. He has spoken about reverse engineering and software security at Black Hat, ReCon, CanSecWest, EuSecWest, Syscan, and other prominent information security conferences. Ridley is a co-author of "The Android Hacker's Handbook" published by Wiley & Sons.