Harold Thomas Finney II was a developer for the PGP corporation and was the second developer hired after Phil Zimmermann. Besides his work on PGP, he also contributed on bitcoin and is known for receiving the first bitcoin transaction from the creator of it, Satoshi Nakamoto back in January 2009. In 2004, Hal created the first reusable proof of work system before bitcoin, but did not achieve the solution to the double-spend problem.
He lived in the same town that Dorian Nakamoto lived, making him a suspect of being Satoshi. Although, he denied of being him. In March 2013, Hal created a topic on bitcointalk.org in which he explained his life after finding out about bitcoin. He also stated that was diagnosed with a fatal disease. Hal Finney died on his 58, in August 28, 2014 and left a great fortune of coins to his children as he mentioned.
Hal's first bitcoin recipient address: 1HLoD9E4SDFFPDiYfNYnkBLQ85Y51J3Zb1 (Has never spent any funds)
It still has 50 bitcoins which are equal to about 1 million dollars at the time of publishing this writeup.