He is the inventor or co-inventor of over fifty patents, has served as the vice president of the International Financial Cryptography Association, and is a research fellow of the Anti-Phishing Working Group. He is an editor of the International Journal of Applied Cryptography and a group editor of the ACM Mobile Computing and Communications Review. He is also an editor of Phishing and Countermeasures (Wiley, 2006), and editor/co-author of upcoming books on crimeware (Symantec Press, 2007), click-fraud (Morgan and Claypool, 2007), and cryptographic protocols (Addison-Wesley, 2007).