A Ph.D. computer scientist with more than 20 years of experience in computer science and computer security, this expert specializes in identifying security vulnerabilities, analyzing fraud trends, and developing technical and user-focused security countermeasures. His expertise includes cryptography, authentication, biometrics, phishing, malware and virus detection, spam and scam prevention, click fraud, secure messaging, digital signatures, encryption, electronic and online payments, mobile security, and applied security technologies. His work has addressed the interaction of computational, structural, physical, and social factors in security systems, including user behavior and adversarial behavior. He has developed security technologies involving authentication and mobile malware detection and has conducted extensive research into phishing, online fraud, password security, and related countermeasures.

His professional background includes positions as Senior Director, Principal Scientist, Principal Research Scientist, Member of Technical Staff, and Researcher at technology companies and research laboratories, as well as Associate Professor, Associate Director, and Adjunct Associate Professor in university settings. He has also founded and held executive or technical leadership positions in companies focused on anti-scam technology, authentication, consulting, and malware detection, and has served on advisory boards involving identity-theft protection, mobile security, user reputation, social networking, and anti-fraud technologies. His intellectual property experience includes being named as an inventor on more than 100 patents and patent applications. He has served as a testifying expert in patent litigation involving areas such as digital rights management, hardware-based security, mobile security, and secure messaging, and has more than 10 years of expert witness experience involving consultation, deposition, and courtroom testimony.

His educational background includes a Ph.D. in Computer Science with an emphasis in cryptography and a later professional focus on applied security, as well as a Master of Science in Computer Engineering. His scholarly work encompasses more than 100 peer-reviewed publications and multiple books addressing phishing, electronic identity theft, crimeware, authentication, electronic voting, and applied cryptography. His research and patented technologies further encompass digital signatures, cryptographic protocols, electronic commerce, password and identity authentication, malware and cyber-threat detection, click-fraud prevention, privacy, and secure communications. His combination of academic research, technology development, intellectual property work, and computer security consulting provides a technical foundation for matters involving computer security, fraud, cryptography, authentication, and patent disputes.