ArtForz
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ArtForz is a regular on #bitcoin-dev. He and Laszlo Hanyecz are considered the first two person to mine with GPUs, using private mining code. ArtForz once held a high percentage of network computation power (~25%) but reports[1] that he now controls less than 1%. He claims that his mining software is still more efficient than all other GPU miners. He uses a heavily-modified version of Bitcoin; notably, he requires less transaction fees and he doesn't perform IsStandard checks.
ArtForz has a very good understanding of Bitcoin. He reported serious bugs in Bitcoin's handling of certain script opcodes.