Co-founder and CEO of Blockstream, Dr. Adam Back, invented Hashcash, the proof-of-work algorithm cited by Satoshi Nakamoto in the Bitcoin whitepaper, as the future basis for its mining function. Throughout his two-decade-long vocation as an applied cryptographer and security architect, he has held senior roles with a number of technology companies, including Microsoft, EMC, PI, VMware, and Zero-Knowledge Systems, as well as advised many more companies on cryptography and peer-to-peer finance. Dr. Adam Back holds a computer science Ph.D. in distributed systems from the University of Exeter.