Finney was one of the better-known cryptographers in the cypherpunk community even prior to his involvement with Bitcoin. Early in his career, he worked for PGP Corporation, which owned Pretty Good Privacy software or PGP. The software allowed users to encrypt their texts, emails and files. In 2004, Finney developed Reusable Proofs of Work software or RPOW. It built on the proof-of-work concept developed by Adam Back in Hashcash by introducing reusability, hence the name. This was one of the stepping stones to Bitcoin; interestingly though, Satoshi did not cite Finney’s work in his white paper.
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Source: Cryptocurrency - investing.com
