Artforz

From Bitcoin.com (11-2019):

"The infamous Artforz appeared as a pseudonym on bitcointalk.org between July 2010-2012. Laszlo Hanyecz and Artforz were considered the first two people to leverage GPU miners when mining bitcoin. In July 2010, Artforz showed the world his ‘Artfarm’ and at the time the miner said he generated 1,700 BTC in six days. “I had 24 (Radeon) 5970s up until about late summer ’11,” Artforz told the Bitcoin community on February 11, 2012.

Between the summer of 2010 and the last time the community saw Artforz in 2012, he was accused of commanding most of the BTC hashrate during those years. For instance, on October 3, 2010, Theymos explained that the developer’s Artfarm could be processing 20-30% of the hashrate. However, on August 25, 2011, Artforz told the community another story and said he only captured roughly 1% of the network’s processing power. Artforz wrote the community for the last time that February in 2012, and no one’s heard from him since."