Before joining NJIT, he was a postdoctoral associate at Cornell University and was also affiliated with the Initiative of CryptoCurrency and Contracts (IC3). He obtained his PhD from the University of Connecticut with a Taylor Booth Scholarship. He also held visiting researcher positions at various institutes including the University of Wisconsin, Madison, NTT Research, Tokyo and the University of Athens, Greece. His research interests are applied and theoretical cryptography, privacy and computer security. In particular, in accountability, post-Snowden cryptography, and blockchain technology. He has made contributions on using cryptocurrency to deter copyright infringement and to enforce key management policy, re-designing cryptographic specifications to defend against implementation subversion, as well as information theoretical security.