Joseph Steinberg is a cybersecurity expert witness and advisor, and a Lecturer on Cybersecurity at Columbia University in NYC. He has led businesses in the information-security industry for over two decades, and has written books ranging from the best-selling Cybersecurity for Dummies to the official study guide for a CISO certification exam. He is one of only a few dozen people worldwide to hold the suite of advanced information security certifications, CISSP, ISSAP, ISSMP, and CSSLP, indicating that he possesses a rare, robust knowledge of information security that is both broad and deep; his information-security-related inventions are cited in well over 500 US patent filings.