Widely recognized as the inventor of digital cash, David is currently leading xx network, a completely private, quantum-secure decentralized messaging and payment platform. He is also known for other fundamental innovations in cryptography, including privacy technologies such as mix nets and secure voting systems. With a PhD in Computer Science from UC Berkeley, he has taught at NYU Graduate School of Business and the University of California. David is the founder of the International Association for Cryptologic Research, the Cryptography Group at the Center for Mathematics and Computer Science in Amsterdam, and DigiCash. Among his breakthrough projects are digital blind signatures, multiparty computation, and random sample voting.