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John L. Gustafson is an American computer scientist, chiefly known for his work in High Performance Computing (HPC) such as the invention of Gustafson's Law, introducing the first commercial computer cluster, leading the reconstruction of the Atanasoff–Berry Computer, inventing the unum and posit number formats, and several awards for computer speedup. He was the Chief Product Architect and Senior Fellow at AMD, and previously held the distinguished positions of Director of Intel Labs, CEO of Massively Parallel Technologies, Inc. and CTO at ClearSpeed Technology. He is presently a Visiting Scientist at the Agency for Science, Technology, and Research (A*STAR) in Singapore, and Professor in the School of Computing of NUS. Dr. Gustafson holds applied mathematics degrees from Caltech and Iowa State University.